Joel, I don’t know if my thoughts have already been discussed, but your mother and/or many of your relatives by your description are exhibiting classic dysfunctional behavior. Much like a person who is of an addictive personality for example an alcoholic.
Your mom may not have had a "drop" during her life. However, she may have been influenced during childhood by someone who has.
It is hard for me to make decisions for myself now. I get very confused because I try to factor in the feelings of all the people around me so that I don't upset anyone. This hampers my ability to build real relationships with people.
With your above comments in mind, check out help groups such as Alcoholics Anonymous, etc. (forget the WTBTS they have none) although this seems irrelevant in your case, much of the behavior you seem to be experiencing is similar.
Most importantly, they will help you identify that you cannot solve the problems of negative people like your mom whom you come in contact with, but teach your self how not to be influenced by their behavior, so you can lead a fuller life.
What steps your mom takes to resolve her problems, only she can make that decision. They are not yours to make because if you try to solve her problems by compromising who you are for her sake, she will take you down with her. Then we will have two dysfunctional individuals, instead of one.
Flip