And of course, from all reports, there was no negotiating with her, all decisions were being made by him, since he was also her manager and that's who you would have had to begun negotiations with. Much as it may seem mean or unfair, On_Headset is right, getting rid of him meant getting rid of her.
Side note: this is why stage dads are ten times worse than stage moms. Somehow there always seems to be a creepy "ick" factor that works its way into the overbearing pushiness.