Woman on the Edge of Time by Marge Pierce (American, 1976)

Summary:
Dolly arrives to Connie’s house; she had been bruised by his pimp Geraldo. Geraldo arrives too with another man so he could practice an abortion on her. Dolly wanted to keep her baby. Connie stands up for her niece (Dolly) and attacks Geraldo, Geraldo beats Connie and gets her into a psychiatric institution lying to the doctors. Connie had been in that institution before as she had a daughter named Angelina, who she got from a violent marriage. She later fell in love with another guy who died in jail. Connie started to take it all out on Angelina and she was taken away from her. This is why she got in again so easily. Connie starts having visions where she talks with a woman called Luciente, who shows her how a better world came to be without racism, consumerism, sexism, environmental crisis and everything that was wrong with the world at that time. Even in this world existed some problems still as there were still some bad and selfish people that tried to make everything as it used to be. Connie finds out that she is the one that has to help at her time to make things better in the future. The doctors want to experiment on her by opening up her brain and putting an implant. Connie learns a lot in the time she spends with Luciente, she teaches her how to survive and deal with her emotions. Connie escapes, but they find her. The doctors start experimenting on her brain, but they fail. They decide to do a lobotomy Connie spends some time with Dolly’s dad before the lobotomy. She gets some poison from his house and uses it on the doctors. Connie might go to jail or get killed for what she did, but she is proud she tried to change things.

Another summary:
The story starts with Consuelo, Connie, Ramos, a 37 years old Mexican American woman.
 Dolly, Connie's niece, and Dolly's pimp and lover Geraldo unfairly take Connie to a New York mental hospital due to her supposed violent behavior against them. 
 Connie has a history with mental hospitals. She lost her husband and her child's custody because Connie hit her daughter while being on drugs. 
 Once in the hospital, Connie argued that she was there unfairly, that Geraldo hit Dolly and her, that she was only trying to protect her niece and herself. But nobody was paying attention to Connie.
 After some time, Connie started to communicate with Luciente, a time traveler androgynous woman who proclaims to be from 2137. 
 Luciente and Connie start to communicate more often. Until one day when Luciente invites Connie to her time. Connie accepts the invitation. They don't travel physically but in astral projections. 
 Also, Connie wonders why she can be seen in Luciente's time, but nobody can see Luciente.
 Once in the future, Connie realizes that this future is way much better than her reality. There is no pollution, no rich, no poor, no discrimination based on gender or race; everybody is equal, there is no homelessness. It is somewhat conscious anarchy. It is perfect. There, people could be whoever and whatever they wanted to be. Things are so different from Connie's present that she gets scandalized by some things but, she also likes it.
 Connie goes back and forth to Luciente's time. 
 
 Connie was selected for an experiment. Dr. Reddin wants to put an implant in her brain. It will allow doctors to switch off any violent impulses. But, Connie does not want to be part of the experiment; and tries to escape yet, she gets caught. 
 As punishment, the doctors put the implant on her brain. After the surgery, things get complicated because Connie is slipping in and out of consciousness.
 Luciente teaches Connie how to contact her and time travel on her own. When Connie is full of psychotropic drugs, everything becomes even more real. 
 One day, Connie ends up in another possible future, which is the opposite of Luciente's future. She manages to go back to Luciente's; their future seems to be at war. So, Luciente asks Connie to go and save herself. They lose contact. 
 The doctors plan to remove the implant and remove the part of her brain responsible for impulse anger control. Of course, Connie refuses such drastic actions. 
 Connie convinces the doctors and her brother Luis to spend Thanksgiving at Luis' place. 
 Luis is the one who authorized to have Connie in the hospital. He owns a greenhouse and takes Connie to his house under the condition of having her working.
 While Connie is working at Luis' greenhouse, she steals an insecticide to poison her brother. However, she changes her mind and takes the insecticide back to the hospital. 
 As the doctors refuse to listen to Connie and, they insist on removing part of her brain. Connie offers herself to prepare the coffee and poisons them all. Connie is sent to another institution for life.

Another summary:
Consuelo Camacho is a Mexican-American woman with a very rough past. She was abandoned by her first love, the two most important men in her life were killed, and she lost her only daughter to the system, only to end up surviving on welfare and being institutionalized a couple times. One day she receives the visit of her niece Dolly, who is closer to her than to her own neglecting dad, and tells her she’s hiding from her boyfriend/pimp Geraldo because he wants to force her to have an abortion. While defending her, Consuelo (or Connie), smashes a bottle in his face and breaks his nose, so, in revenge, Geraldo beats her up badly and arranges to have her institutionalized once more on aggression charges. While she tries to navigate her time in the “loony bin”, Connie gets used to her newly found ability, catching, which means she’s able to receive the mental projection from someone in the future. This way, she manages to strike up a friendship with Luciente, a woman from the future who is kin on showing Connie the ways of her time. Connie begins to learn a lot about this new society as she interacts and befriends Luciente’s mems – this time’s equivalent to family. After a while being locked up, Connie discovers the doctors’ plans for her and some other patients: to practice some new machines and surgeries on them to try an “control their dangerous impulses”, which basically means turning them to mush. Consuelo finds a new resolve in fighting this war and, with the best wishes of her future-bound friends, she strikes back by poisoning four out of the six lead doctors in the project.

World view: Describes in a variety of aspects and with some consistency an imaginary state or society which is regarded as better, in some respects at least, than the one in which its author lives.
Future projections: Sees the future as potential to reform a reality that once seemed unchangeable.
Ideology: Explains how a better society came to be, in which sociopolitical institutions and individual relationships are organized to a more perfect principle than in the author's community.
Characters, plot and writing style: The story features a rebellion against the adverse circumstances (revolutionaries may exploit newer technologies for these ends).
Classification: Dystopia