Does your daughter have a passport? Is there any way for her to just secretly get a flight?
I'm sorry, I don't know what is involved. I read a story recently though about a girl in a similar situation and she DID eventually escape by fooling her dad, saying she was going to some other country for part of her job she'd just started, so he agreed, and she really flew back to England. There are lots of people who escape, please have hope. I imagine you must have contacted everyone possible to seek advice, so I'm really sorry I can't suggest anywhere for you to go.

Do you know what is actually stopping her from getting a flight? Do they not allow women to travel without the father's permission?