For a while now, I've been working on a novel. I've had some help from my sister. She let me bounce off ideas and such things. She hasn't written a word of it, and doesn't want to even look at any version of the drafts until it "completely done." If I'm lucky enough to have it published, she expects a co-author credit and half of anything that comes in from it. That doesn't seem right to me. Do you have any advice on what I can do?