What do I do when my friend is being abused?

My friend is being physically and verbally abused by her mother and her brothers. Our friends and I(as well as Brit) have gone to the counselor about this and she suggested that brit should runaway or stay at my house or my other friends. And she knew that brit was coming to my house and she said that was good of us to be such great loving friends. When brits mom came to the school(the day before) she lied to protective services and said that brit was lying for attention. and when she came home with me, we hang out a little,(she was very nervous) but later my mother called from work and told us that Brit had been reported as a runaway and then my grandmother told us that the police would either come or we could return Britt home before that. And so we did. But the protective services can't do anything without a warrant that she is being abused cause brits mom won't let them in. AND her dad, who ually touched when she was younger then went to prison then went to iraq and is now coming to our school thursday(tomorrow) to take her to georgia(we live in Michigan) We are worried about Brittney that her mother will hurt her tonight and we'll never get to see her again. And her dad will touch her. She probably can't call the police or run out the door to the neighbors because she is afraid of her mother and now my friends and I are chatting by phone so, What can or should we do? We want to help in the most. Please answer.