She needs to contact women's aid now and tell them her plans. They could possibly help her move too depending on staff etc in your area.
She should contact the police and tell them too.
It's going to work in her favour to have as much of a paper trail as possible. This will also help if he decides to press charges for theft or whatever.
Women's aid will really help her get a place of her own with the council so it's important they are involved.
If, at any point, she decides to press charges then the police will have a record of the call.
The important things are any bank documents, passport, ID, photos that can't be replaced, everything else can be replaced.
She needs to delete anything with your number, any contact details or anything that suggests she has contacted you or he will know where she is.
Monday morning she should probably try and get a solicitor and get a non molestation order (these can go through very quickly in cases of domestic violence) and get benefits sorted out, these can take some time to sort out especially as she was working for him, he could make it difficult.
You are an amazing friend 