I Loved You All, by Paula Sharp.
Marguerite is an alcoholic and is taken away for treatment.
When Marguerite returns from treatment sober and remarried but unapologetic about her past, Mahalia moves in with Isabel, accompanying her on church outings for anti-abortion protests. So, yes, this is a book about abortion. But as prominent as the issue is in this novel, it's never as important as the characters themselves, and that's how Sharp succeeds where other novelists have failed. I never doubted alcohol's right to citizenship in our world. While all the characters have opinions and actions related to the abortion movement, Sharp knows that those thoughts are driven by other parts of their personality and being, and this is where her book rises above the mundane.