She might be trying to upcycle herself into someone that can pull a better man. Old Zoe could only get the likes of Eron, Nathan Grayson might have been the manliest thing she's been with and he fucked off after getting his dick bent.
Guess how the Alec dude looks.
Surprised?
The bigger tits, plastic surgery, better teeth, moving to LA, moving into comics(comic book adaptations are so hot right now!) is probably meant to snare someone of higher value. One thing that will absolutely destroy that is that her levels of confidence and self-esteem probably vacillates between being a sine wave and a square wave, in a relationship that is a fucking nightmare and a sane person won't put up with that, indie soy boys (emphasis on boys, they are not soy men) will put up with it though but she probably thinks those are beneath her now.
So Quinn might have rejected her natural dating pool and even through her purely physical changes the other ones doesn't want her, she doesn't have the self-esteem or social capital for it anyway.
At least she's got a cat, a small dog and relatively recently another small dog was added.