I wanted to try some of the more evil options in the game, but for whatever reason on Cali's she just escapes three days after I enslave her. I've tried multiple different things to avoid that happening, but no matter what I've tried, she just runs away, and I haven't gotten any indication on how to avoid this.
Anyone know what I'm supposed to do?

Looking at the code suggests that when she asks "You think I'll work for you?  After what you've done?", you should select the middle option (threatening to sell her to someone even worse).  Either the first or third options will lead to her running away.  

That was it, thanks. Boy I feel dumb for missing that