My friend (17) has been kicked out by both parents?

My friend has lived with her mum for all her life (she is 17), and then her mum got a new boyfriend who started to hit her. & her mum kicked her out for "lying" about it so she went to live with her dad who she had minimal contact with growing up. Anyway, long story short - her dad doesn’t like her going out with friends or for nights out or anything like that because 'the dog will be on his own' - he uses the dog for emotional blackmail. He is controlling, and doesn’t like her texting people etc, but then says she has no friends and is boring and stupid when she is staying in for the day (due to be being told it would be horrible to leave the dog). He demands that she gets up at stupid times to go and get HIM food or make HIM food and if it isn't just the way he wants it, he will just chuck it in the bin and expect her to make a new one, as if she should be grateful she is living with him or something. The dog is only a young dog too, and he says to her that the house has to be spotless at all times, (and even clear up his mess that he makes when his friends are round to watch the football). There is more but it would take to long to write - overall - he is controlling, manipulative and mean. She has always said she finds her dad intimidating. Yesterday she finally asked him if she had done something to annoy him and he basically said she's a horrible person and to get out of his sight, so she did and she slept at my house. Today she has gone back to her dads, and he has text her saying she needs to get out of the house by the time he is home from work with all her stuff gone. But what can she do? It's not like she can go back to her mums, and her grandparents on her mum's side believe what her mum is saying, and her grandparents on her dads side live in Spain. She is doing her A Levels at college and doesn't have a job (despite looking). I just don't know what to do as I have the complete opposite family life. Any advice on what she could do? We live in the north west, UK.