<human>: Basically my girlfriend is in a constant state of stress due to her mother being the epitome of a mean, bitter, and overbearing lady. 

Her mother constantly lectures her and tries to controls the minutiae of her life. It's starting to affect our relationship - I sent a letter to my GF and her mother delivered it to her and it became an opportunity for her mom to get up all in her face about boys, marriage, plans, life lessons, etc. etc. 

Her mother is trying to interject herself into our plans to go on a road-trip soon and is driving my girlfriend up the wall to the point where she has to leave the house before she breaks something. She's called me in tears a few times now.

This has been an on-going problem. When we were together my GF would often receive texts from her mom (over 200 miles away) demanding details on my GF's life plans and such. This is a QUICK mood killer and it drives me up the wall and totally bums out my GF. 

I really just want my girlfriend to more or less cut her mom out of her life because its not conducive to her psychological health. How can I help her? She currently can't leave her mom, due to surgery recovery. How can I help her cope with her crazypants mom?

Can you give me the gist of the text in a nutshell?
<bot>: My GF is slowly being driven to madness, it's affecting our relationship. I'm looking for advice to help my GF stay strong or ways increase the health of our temporary long-distance relationship.