Do you "owe" her for the rest of her life? I am thinking you are likely doing as much as you are for her because of guilt, as you say in your title. Since she is able to do for herself, then I personally don't think you must do all you do for her. Sounds like she is really milking your guilt.

I am thinking you should consider talking to a therapist about your situation. Then you will also have a support person as you work on possibly cutting back on helping your mom and dealing with the backlash.