Can hate to same gender parent cause homosexualism? I know a girl who is (or claims to be) lesbian.
I also know that big part of her childhood (12-now years) she hated her mother.
Her father left family when she was infant (1-2 years). I dont know what she thinks about her father.
She is 17 now.

I wonder, is it possible that by not-accepting her mother, she does not accept her own gender? Or is it more likely that not having a father, influenced her sexual orientation?
Was any documented research conducted, that would confirm/reject that?
Any other thoughts on that?

EDIT

I should have mention about it earlier but somehow I forgot about that.
I know that she had experiance when she got home earlier one day, and saw her mother with her lover having sex. She told it my sister. More or less after that, she started to dress like a man and (I think) she lost this 'little girl/child' identity. She become more serious and her marks at school rised very high. She is the best in class now but before that experience she was one of the worst.

I dont know if this is relevant, but she consider herself as a loner and watches a lot of anime now. I think this is all what I know about her.

I feel confused. I always thought that only small percent of people are really homosexual (because of chromosome mutation), and the rest just believes (because many possible reasons) that they are.
Gender is not, despite what others might say, a social construct, and neither is sexuality, just google David Rimmer to see what happens when researchers have messed with these. While we don't understand what causes homo-sexuality fully, typically speaking sexuality seems to be influenced by hormone exposure in the womb, when a human is a foetus. Although studies have found that roughly 5-10% of people have had same-sex sexual experiences, this appears to be relatively common in adolescence although it does happen later in life too. Speculatively its possible that this partly comes from people learning about themselves and their sexuality. However despite people having these same-sex experiences only 1-3% of people identify as homo or bisexual. Why do people have these experiences? There are a a multitude of reasons, some people are homosexual, while some may be curious or undecided, or perhaps some other reason. 

Ignoring the sexuality side and looking at group identification: people have all sorts of reasons for identifying with particular groups or demographics. While relationships with parents are certainly cause for being rebelliousness, its not going to turn anyone homosexual who isn't already inclined. There seems to be no recent evidence about parenting style and sexuality, apart from on religious websites that have no place here, although stonewall say that there is no relationship. However the research linking the two is absent, which usually suggests either it hasn't been researcher properly or, more likely, that there is no relationship at all.