Will My sister ever stop being a lezbian?

First I wanna say if it is your job to hate, Change the question. My sister was in prison for 2 years for guns. She'll get out next week. she has a daughter 5, and 4 and a son 3. And a baby's daddy AKA Boyfriend. So she's in prison and is a lezbian. We saw pictures of her "girlfriend" and she prettier too but it's weird. This is how it happened. The girl was concided and though that she was priettier than the other women until this stud made her a lezbian and she saw my sister and thought she was prtty so she told one of her friend's to ask my sis did she want her. and my sister said yes and now tey're together. When my sister comes home will she still be a lezbian or will she go back straight? I need answers because if she's gonna stay a lezbian than she can't see her kids cus I don't want my neices and nephew going through that.