Sorry...I disagree...your friend knows her husband is a jerk. One time I gave a friend my opinion about her husband (and she had asked!) She went back with him and never spoke to me again.

I would decide whether I want to be friends with her in spite of her husband....but I don't offer unsolicited (or solicited) advice to anybody when it comes to relationships. If I decided to continue the friendship it would be non-judgementally.