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This is going to be difficult to do anything here, because if there is nobody who is conservator or guardian over her mother, then it is up to her mother to contact her and if the mother will not talk to her, there is nothing legal she can do.
If she can prove that somehow the mother is now becoming mentally incompetent, then your girlfriend will have to go and try to get guardianship or conservatorship over her too. But absent mental incompetence, there is nothing your girlfriend can do if the mother is not communicating with her.