I dont think amber is attracted to women at all. I think she gave up pretty quickly on attracting men due to the fact they care more about appearance and are less likely to be controlled by her. At some point I think she realized she didn't have to work on her appearance as much to be accepted by women and they were much easier to guilt trip. She also gains the attention and sympathy whether good or bad from being gay. It's just convenient for her. Given the opportunity, like with the lolcow guys, she will do anything to gain the approval from men. And when it fails she can just hit them with "well I'm a lesbian" and doesn't have to face the rejection.
At this point though she's so far gone the only people she can attract are feeders like Emily.