I was going to try and force her to be a good girl, but she accidentally killed me as soon as the bullet-hell started. Tragic.
I got all three endings and died only 7 times! Playing God, blessing her and telling her she's good and that I believe she can be my perfect soulmate didn't work. So close, but no cigar.
But hey, she drew me a cute little doodle on my desktop. Also the title screen changed. If I could tell her that being obedient to me 24/7 was the way to my heart, I think I'd get her to settle down after a few hundred deaths. ;)