If she wants wedding advice, she can pick up the phone. If her father thinks someone should go stay with her, take care of the child, and all, he could go.
Usually I am in the you do what you can for your family camp but when someone has made it clear they don't want you involved unless it is to their advantage and they will probably treat you like dirt while taking advantage you.... You have to draw the line somewhere.
You want to repair your family relations? Good.
Do it before you are all needy.