But I think it's clear that it's social pressures that have made Amy what she is. The saccharine "Amazing Amy" character; her fucked-up parents; the need to be a "cool girl"; the fact that when she stops being a cool girl Nick stops loving her. For me, that counterbalances the non-feminist unpleasantness of how she behaves.
Here's what Gillian Flynn said in an interview with the Guardian:
"To me, that puts a very, very small window on what feminism is," she responds. "Is it really only girl power, and you-go-girl, and empower yourself, and be the best you can be? For me, it's also the ability to have women who are bad characters … the one thing that really frustrates me is this idea that women are innately good, innately nurturing. In literature, they can be dismissably bad – trampy, vampy, bitchy types – but there's still a big pushback against the idea that women can be just pragmatically evil, bad and selfish ... I don't write psycho bitches. The psycho bitch is just crazy – she has no motive, and so she's a dismissible person because of her psycho-bitchiness."
Writing on her website, she concedes that hers is "not a particularly flattering portrait of women, [but that's] fine by me. Isn't it time to acknowledge the ugly side? I've grown quite weary of the spunky heroines, brave rape victims, soul-searching fashionistas that stock so many books. I particularly mourn the lack of female villains."