wow, I feel sorry for this girl. Growing up is hard to do, and then on top of that, not being allowed to have friends while you are growing up is even harder. Is this girl in school? Is she allowed to have friends over at her house? If she is, then she can have friends over that will be able to show her parents what kind of people they are, and that they are shareef. If she can do that, that is going to help her in the long run. As her parents get used to seeing the same faces, and they get to know the friends better, they may lighten up. Maybe they dont allow her to go out with the friend cause they dont know the friend, even though this girl knows that she is very shareef.
The only advice I have is to invite friends over, and let her parents see them, and interact with them on their own turf, where they are comfortable, and they can keep an eye out for anything “bad” they think may happen. Once they see that their daughter has a good shareef friend, they may lighten up.