This will be a rocky marriage if they don't get their own issues in check. I was married while the issues were in check and when stress of married life happens - we tend to go to what is comfortable - for him that would be alcohol and for her that would be not taking medication that it appears she needs.

Be honest with them regarding how you feel - marriage is hard is probably the most understated statement I have ever heard. Marriage will take everything you got and more with heavy reliance on God.

The whole domestic violence issue will probably esculate as stress levels esculate - I would not think it would be safe for her.