Interesting story. It does sound like she has matured enough to let go of that Daddy/girl relationship and seek a more balanced egalitarian one. My only advice is, don't move in together (yet)! Sounds like she needs some time living independently for a while.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
There's no lying in polyamory!
I'm a 58 year old woman with 2 partners:
miss pixi, my live-in gf, 36 (together since Jan '09)
Ginger, bf, 61, married, lives nearby (together since Jan '12)