As a parent I sometimes worry that decissions I make concerning my kids may end up being wrong, but I always try to do what I think is best for them. And I do mean what is best for them, not what is best for me so it must be best for them. I want them to live their lives as they see fit, not the life I might want them to have. That's their right and I just hope that by the time they are adults that I've given them the basic foundation to be decent, productive members of society.
Your Mother sounds like a lovely woman. And she wants you to have the opportunity to live your life as you see fit to do. She has certain responsibilities in her life that are just that, her's. She doesn't want you to feel that you have to be an extension of her, and therefore, be responsible for any of her decissions. Live your life. Sounds like she did a good job of that basic foundation and if, in the future, she needs your support she'll let you know. And she knows you'll be there for her.
Sharon