Jo I will be praying for your friend.
I don't believe God intended for any human being to be abused or to take that abuse. And, I'm fairly sure but I'm drawing on childhood knowledge here so take that into acct, that if she looks in the bible it is stated in there ground for divorce that is approved by God, abuse is one of them, adultery another. My mom is a religious fanatic.....and well, someone had to point that scripture out to her to motivate her out of a really bad marriage. And I'm sorry after more than 20 yrs, it's time to give up on the idea she's going to change his way of thinking........because she's not, she's feeding the problem without meaning to.
I wish I remembered exactly where it is, but I don't, just that it is there and if she speaks with her pastor or someone else very knowledgeable in the bible it's not hard to find.