All of you "lock 'em up and throw away the key" types are good for a nervous laugh, but seriously, she killed her boyfriend, and there's no telling what he did to get what he got. I have a sneaking suspicion he was treating her like one of his ... er ... concubines, and she didn't take too kindly to this. (Now, after having written this without the foggiest idea of what she did, I'm curious, and I am going to do some research, test my hypotheses.)
In the meantime, let her go. She's harmless now.