"How do I help my daughter work through a troubled marriage?"?

she runs to my home when they fight and consider ending the marriage but when I told her to go home and work out her problems , her husband said she could not come home cause they needed to be apart to make things work , I think he is full of crap , I think he wanted her out to have females over…. oh well…So when I told her to leave he wanted to know why I would not let her stay , and I told him I was sick of his games… so he said I was not welcomed to their house and I was never gonna babysit or see the Baby again… My Daughter is back there as of that day July 1st and I have not heard a word from her since then…. Before she left , I said I was SORRY and that she knows I would never turn her away….I don’t know what else to do , I am missing the Baby , at a very important part of her life , I just dont know what to do , ???