This is Kitt. Wow is right, I am so sorry for your daughter............I am sure she is blaming herself and thinking she was pregnant and not attractive to her husband and all the "stinkin thinkin" that goes with depression. I know she must also feel devestated as this was her dream to have a loving husband and then a baby on the way.
As her Mom, I imagine you too are devestated for her and watching her in pain is tearing you up.
Please remember Depression is a illness and she is not just acting out. She does need professional help.
Sit down with her and let her spill her feelings out to you and please Mom, support your daughter in her feelings as they are legitimate. Hug her, hold her while she cries. Then talk with her and beg her to go to therapy. Maybe if you offer to drive her and sit in the lounge so she knows she is not alone would help. She has to agree to want to go...............you cannot drag her.
It would not hurt her husband to go to therapy for himself to discover why he would choose to cheat on the one he loves...................something is not right in his mind either.
I don't mean to sound judgemental but my heart goes out to your daughter and I will pray that she will accept help.
You are a great Mom for advocating for your girl.