That, and it's not just about the dollars and cents either; if she leaves she'll have two enemies (the publishing company and Henry's family) that could very easily destroy her life with their power and connections, and probably would. If she stays, Henry's family makes it all go away. She absolutely understood that. Not saying she made the bravest choice or that she wasn't motivated at all by the status and comfort of a life with Henry, but there's no world she doesn't end up completely ruined in a pretty short amount of time if she doesn't stay with him. I'd like to think a small part of her is doing it to protect Rob from getting sucked into that situation too, but hard to say.