The decision to stay and finish your degree or to quit should be entirely yours, not your mother's. If being independent from her opinion means being independent financially, then do it. It seems to me like your mother is using money to blackmail you anyway, and that your lack of independence isn't doing you any good. If I were you, finding a job, a grant or a loan and paying for my own damn life would be my priority.
If you do decide to quit, 22 is still young. You have plenty of time to figure out if you want to start on a new education track. Actually, in my experience, some experience in the working world is a great way to find in which direction you want to go, much easier than by staying in school (unless you want to work in academia).