I don't think that you are being selfish. Your daughter can finish growing up in Florida (and maybe the move will give her some impetus to move out and live on her own).
My parents moved to a Florida retirement community while I was in college. I used to go there for the summers. It didn't really bother me as I had friends my age that I met at my summer jobs.
Your daughter can go to the local community college to meet people her own age. I think that she will be fine.
She won't live with you forever so you need to do what is right for you.
~Kathy
