I think she is free to label herself and her sexuality any way she wants, as we all are, but it's a step too far to say that she is 'redefining' heterosexual marriage in having had relationships with both men and women.
Human sexuality has always been fluid, sometimes of necessity. In our homophobic past, it was very difficult for LGB people to openly live in a way that matched with their sexuality so it was common enough for people who would nowadays be openly gay to live in a straight marriage for the purposes of 'respectability'.
I'm a boring old heterosexual so what would I know but if I were gay, I would be mighty pissed off at any blue-haired 20-something with notions about how edgy they are appropriating the term 'queer' to pretend they are interesting based on a one-month fling they had in college with someone of the same sex. Kind of insulting.