What will you do if you were in my shoe?

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I have a 16 years old cousin and the story is this: She and her friends went to their house to practice some dance routines. There were 5 guys and 3 girls including her. His brother came and got suspicious so he contacted his mother to go home and check the situation. Their mother came and told them what is going on. The daughter replied that they were practicing and her mother began talking non stop like they were just fooling around and such. The visitors were frightened and decided to go home already. The daughter accompanied them to go out and when she came back, her mother still goes on talking. She talked back and her mother hit her in the face. Finally the daughter decided to walk away from home and now it has been 3 days and she went here in our house. I would like her to stay here so that I could call her parents and pick her up but when I learned what happened, I changed my mind. She was with three guys that looks suspicious but nobody knows a person but their friends right? So I don't have the right to judge them. I let them eat for a while and let them go. I know how she feels like everybody is mad for a reason that shouldn't be. I also talked to their parents and I found out that she is telling the truth and her parents admitted it but still they insisted that I should have make her stay here and called them. If they really care about her, they should have accepted them to practice in their own house instead of different places right? So I think that I should let her walk her own path even she is 16 years old and hopefully her parents could consider the things they are doing to her. Note: She also stated some awful experience from her mother but I wouldn't include it coz it is too long. Let us concentrate here :D If you were in my shoes, what will you do as an elderly cousin?