I honestly think that Bella staying human would be anti-feminist. Like she said, a man and a woman should be on EQUAL levels, and if Bella stays 'breakable' she's putting herself and her family at risk. She doesn't want to be weak and always have to be saved. And I also don't think that sacrificing (i.e. giving up her life) for love is anti-feminist, I think she knows what she wants and she's going to do some hard stuff to get it.