Discussing your daughter moving out of your house and into her mothers has got to be very difficult for you. Seems if it isn't one thing, it's another, eh?
Has your daughter mentioned to you that she would like to live with her mother? My concern is that if this move isn't a desire of hers at this point she will be put in an impossible situation if it is presented to her. The possibility that she will feel torn between the two of you is very great.
It breaks my heart to see the children so torn and having to make such impossible decisions.
Good luck and blessings as you continue to work through this new twist in your lives.
~ swl
Look not mournfully into the past. It comes not back again. Wisely improve the present. It is thine. Go forth to meet the shadowy future, without fear. {Henry Wadsworth Longfellow}