Friend came out as bisexual

Lottie

My friend came out as bisexual to her parents yesterday. I have know for about a month now and I am totally cool with it but she is having a really hard time with her mom she says her mom hates her now. Today she couldn't even go home she had her gram pick her up. I want to help her and give her advice but I don't know what to say. To make matters worse we go to a Christian school that doesn't approve. Please do you guys have any advice on how I can help her. It would be much appreciated.