It was a decision that was made by the X-Office as Rachel would be returning from space and they would have Jean/Hope there. Aka another redhead with Phoenix-like powers. So in order to differentiate the characters (because we readers can't tell the difference) she was reverted back to her 811 settings by Yost and given the houndmarks. Yost said that the Phoenix Force removed all the good things when it was pulled from her. So her hound settings came back then. But EVERYONE who has written Rachel (minus Brubaker and Bunn) has written some type of possession enslavement. Claremont - Davis - Weinberg - Claremont - Yost - Carey - Aaron - Guggenheim - Rosenberg - Taylor - Brisson. I'm honestly wondering why is it still is ok to have a female character be forcibly enslaved by mostly male villains and have to be rescued in this day? And then literally have this same story play out in a different book by a different writer the next month. And then two months later again.