Hi! I remember hearing about your mom from the New Member Intro, and you might recall I said that my mom was somewhat the same way. It's interesting how she has latched on to you more so than your other family members. But am I right that you are her only daughter?
I understand your feeling sorry for her, but that said, you need to keep your sanity and have your own life, too. I am thinking she might have borderline personality disorder, but I am not sure. However, I do suggest you read the book "Stop Walking on Eggshells." The main issue is setting some boundaries.
I had to get a therapist to support me in being able to set boundaries with my mom, so I do recommend that, too.