The big unknown (unless I've forgotten something) is how long has the psychological interference of her father been going on for. How long has Maya known she's only interested in girls? She mentioned to the mc she tried hetero relationships in the past and it never worked for her, so was Josy her first? An over religious parent doesn't necessarily mean years of psychological abuse, and if Josy was her first and her dad only found out about it relatively recently (in the last year or so) and he handled it terribly (trying to force her straight), then we're not talking years of trauma, just one prolonged, lousy incident with a misguided parent. I'm not going to underplay the importance of supporting parents when an (adult) child is trying to negotiate their non-conforming sexuality. Given that sexuality is one of our most defining factors as a human being, having parents tell you it's wrong is obviously very destructive, but I still think we're placing more weight on the "Maya Dramas" than it warrants.
We don't have much hard data. We know Josy was the first (and only) girl Maya actually slept with, and we know that happened the summer before the game began (the Episode 4 flashback). We know that at some point Maya's dad learned about the relationship and reacted... badly. I do think we can speculate a bit, though.
During the camping trip, Derek threatens to tell Josy how Maya feels about her. Clearly Maya had already recognized her attraction to Josy by that point, enough not only for Derek to pick up on it, but for Maya to understand his 'threat.' From that I take it that Maya may not have done much with other girls yet, but she was sufficiently cognizant of her sexuality to recognize she thought of Josy that way (and not, for example, Lynn).
I also think the fact that the four of them were able to go on that camping trip suggests that while Maya and Derek knew Maya was a lesbian, her father was not yet aware of it. I can't imagine he would allow Maya to sleep over with two girls otherwise, even if he didn't
know for certain Maya liked one of them. But in her graduation photo, her dad is ignoring her, even though she graduated Magna Cum Laude. That suggests that on the specific topic of Maya's dad punishing her for her sexuality, it's probably been a year or so at most, and about half a year at least.
We also know, however, that during the camping trip, Maya mentions that her father probably wouldn't allow her to have a summer job. And if she shows the MC her family photos, she mentions that her dad was "pretty pissed" when Derek didn't want to be Santa Claus for the photo. So it does seem likely that Maya's dad was never one to foster independence in his children even before Maya came out of the closet.
Exactly what that means is up for debate (unless we get a Maya family flashback in Episode 7). I don't want to overstate it, but I think there's room for some degree of psychological trauma there.
All that said, this is just my opinion and I don't intend to argue it ad infinitum with you guys, each to their own and all that.
Fair enough. No more from me.