I can't imagine anything more humiliating than being a microscopic parasite trapped in the ass of your worst enemy and having no other choice but to either dine on their "butt cheese" or starve to death. That has to be a very difficult decision to make. But if she is going to spend the rest of her life there she will probably grow to accept it over time. Maybe after a few years it might feel like home to her and she might even enjoy it? Who knows?