Has my friend turned lesbian at middle age?

[Rebel Rouser]

I know of a number of women who hit age 35-45 and forsake men for women, whether it's because they were always lesbians but in denial, or they finally realized all men are lying pigs. BUT one of my best female friends was married and divorced twice and now she only hangs out with her best closest girlfriend. And yes, I have another question on yahoo that is similar to this one. But most of the answers were that women who begin to date other women in middle age have always been lesbians, BUT this friend of mine positively liked men all the years I've known her. But lately, she's seemingly re-invented herself as a lesbian and fed up with the "shortage of nice guys". On her Facebook page, she has photos of herself kissing her new female pal. It's like she woke up at middle age and said "What the hey, I'll just turn gay".
And yes, I do know of at least 10-15 middle aged women like this, but this particular friend surprised me because she is gorgeous and could even marry a rich man if she wanted to. So how do the "gays are born, not made" crowd explain a woman that loved men with a passion until age 37 who suddenly burns with love for another woman?

[ProfGene.Togolot]

First of all not all men are lying pigs. She might be bisexual.