Why not a Sleepover with Boys ?

Her foster dad takes very good care of his little princess. She wants to invite some of her school friends to a sleepover at the Dragon realm very cool family cave when her parents are away for the weekend. Dragon dads are rather old fashioned and expect that male friends first have to meet them in person and alone on a moonless night in order to withstand a critical questioning about their intentions with their daughters. Hardly anyone will dare to do that. For girls who are invited, a telephone confirmation from their parents is enough to agree to an overnight stay in the dragon's cave. But the dragons don't have a telephone. The daughter rightly feels that she has been deprived of the joys of her younger years. Inviting guests who could be braised and fried against the parents' wishes doesn't seem to be a good idea either.

In two years she will be of age and will then look for a small apartment in the nearby town. Then she can do as she pleases.
Her father will definitely respect that.