Silver (90210) In season 3, Teddy and Silver break up due to his drinking habits, this hits Silver particularly hard because of her late mother's history of alcoholism. After their break up, Silver begins to focus on the West Beverly Blaze, which starts Mr. Cannon's interest in Silver.[5] Silver is almost drugged by Cannon when she stops by his house to watch a documentary, but she leaves after noticing that Naomi had said exactly the same phrase that was said by Cannon in the video.[6] Due to her work in the Blaze, Silver develops a close bond with Navid Shirazi and helps him with his problems regarding his father. Silver even goes undercover as a porn star in order to help Navid investigate. As she gets to know Navid, she realizes what a great guy he is and slowly starts to develop more romantic feelings for him, this is particularly encouraged by his recent relationship problems with Adrianna. Silver and Navid almost kiss and they begin to accept that there is something more between them. In 'The Best L'eid Plans', it becomes apparent that Silver's feelings for Navid have grown stronger, when they spend the night in her room talking about his father. When Navid and his current girlfriend, Adrianna, have an argument, Silver seems relieved to hear it and hesitates but agrees when Adrianna asks her for help to fix Adrianna's and Navid's relationship by helping her plan something special. As Silver takes Navid away from the party, he confesses that he has feelings for her, but the moment is interrupted by Adrianna and Silver is left disappointed. In the episode Holiday Madness, when Navid confronts her in school, before he has a chance to explain what he feels and how he has no feelings for Adrianna anymore, she stops him from saying too much and tells him that it is because they have been spending too much time together and so they should keep their distance. Everything seems to be going well until Silver attends the sleepover at Adrianna's new house but only Silver and Navid are able to attend. The tension becomes apparent when Silver, Navid and Adrianna are to spend one night together. As Adrianna sleeps, Silver and Navid are unable to and so they run into each other in the hallway. There, Navid brings up the feelings he has for Silver again and he asks her if what he feels is all in his head. Silver says 'yes' but does not look him the eyes, making it obvious that she does not believe that. As Navid steps closer to her and asks her if she doesn't feel anything for him, the moment is interrupted by Adrianna, again. Later on at Adrianna's Christmas party, Silver finds Navid alone and as he apologizes for ruining their friendship for feelings that he "thinks" he has for her, Silver finally admits that she does have feelings for him and he kisses her.[7] Silver gets a text message from Naomi and decided to rescue her at her own apartment. Mr Cannon then holds Silver and Naomi hostage, but they eventually tie him to the chair. Naomi slaps Mr. Cannon and nearly kills him with his knife that he threatened to kill her with. But Naomi breaks down with Silver. They call the police and Mr. Cannon is arrested. Later on, Adrianna finds out about Silver and Navid. When Adrianna pretends to think it was one of Navid's ex-girlfriends, she tells Silver she is going to send a nude picture of her to the entire school. Silver stops her and comes clean that she is the one Navid was cheating with and that they are in a relationship. Adrianna then tells her she knows, and she texts a nude picture of Silver to the entire school. Silver and Adrianna go back and forth playing mean pranks before they appear to reconcile, but Adrianna switches Silver's medication for bipolar disorder. She then begins to behave strangely: she dyes her hair in red, she calls Christopher several times, the man who she had an interview with for NYU in the afternoon, etc. After receiving some distressing news about NYU, Silver has an emotional breakdown, causing Navid and Dixon to stage an intervention to make her go to a mental hospital. While Silver is in the hospital, Adrianna takes the opportunity to get close to Navid by getting him drunk and telling him that they kissed. When Navid continues to reject her, Adrianna tells Silver that Navid kissed her, effectively breaking them up. Fortunately, Silver finally discovers the truth during Ivy's bachelorette party when her medication falls out of Adrianna's purse. Adrianna is rejected by the group and Navid and Silver reconcile.

Question: when does silver find out adrianna switched her pills