<human>: Can you give me a shortened version of the text?

My mother is widowed, living on disability and does not have a super high quality of life due to issues with her back and poor health. She has remained relatively independent but most of her days are spent at home watching television though she leaves the house to get groceries, go to doctors, exercise etc. 

She has some friends in the area, but many of them have families of their own so most of her social contact is with my brother and relatives who live abroad over Skype and me on the phone. I live in a city three hours away and try to visit around one weekend a month. Once my wife and I settle down somewhere, I would like to move her closer but right now we wouldn't be able to do it.

Though I try to call her almost every day, it is becoming very difficult for me to maintain a relationship that is healthy and lets me stay sane. Many conversations turns into a guilt trip, an accusation of how my wife and I are emotionally distant, how everyone else around has their families and so on and it breaks my heart. 

Unfortunately, I don't think I would be any more available even if I did live closer because of how difficult it is to communicate with her. I set boundaries when she becomes intrusive, but she turns that against me as evidence of how cold and distant I have become. I want to help her and support her however I can but she needs something that I am not sure I can provide. Would love to get your advice internet.
<bot>: Widowed disabled mother living alone constantly pushes buttons and makes it difficult to have a good relationship. Want to put some distance emotionally but she is dependent in some ways. How to best proceed?