You really can't dictate her past and you certainly can't project a broad description of a person because of their nationality. Your family may want to spend time getting to know her rather than make broad generalizations. When you married you agreed to love and respect each other. Everyone has a past. It doesn't have to be the same past but most people have a past. If you are considering having a child then you have to accept what each other brings to the table. I am not saying to accept what is negative for face value but you have to now discuss how you feel about this information.
As far as her friends, nothing has change. You may be having feelings because you have this new information. If you trust her the sex of her friends shouldn't matter. you can ask for compromises so that you are both happy. If depends on what boundaries you are happy with but don't project this "slut" idea onto her friendships. Talk together and see if she is willing to compromise.
If this is helpful press accept