Without hurting the harmony between the two families? Your mother went to her house to criticize her and called her mother to scold her. Don't you think it hurts?

There is something wrong with the way your girlfriend handles things. It's wrong not to go to your house anyway. It is necessary to see the old man when he is ill. You should guide her well and tell her to be filial to her parents, so that she can be together all the time. Things don't go well because of small things. First, talk to her, and then let her know that she is wrong.