I have had family counselling where there was a history of abuse.
I have also had marriage counselling where there was a history of abuse.
It's not recommended but some counsellors will do it.
Also, the op and her husband may have done issues. Her husband may not have been backing her up. Etc etc.
But hitting people is wrong and it doesn't matter whether her husband wasn't backing her up. Hitting isn't an ok response to that.
And in answer to another poster (sorry I forgot the name) yes abusers often feel sorry about what they have done.
There's a row, it escalates, they hit, the other person runs away/hides and then they are sorry.
They start saying things like I don't know why I did it or I was angry or it was her fault. They say it'll never happen again. They'll say anything to keep their situation unchanged - they don't want to lose their marriage and their family.
But unless they change their reactions to anger it will happen again,
Ask me how I know.
psychcentral.com/health/cycle-of-abuse