Remember that you made a contract before you fell into a body(read all of Rudys NDE experience) and your energy-sucking mother is part of that contract. She can only deplete you of energy if you allow it. Block that negative energy flow with love, love for her, love for a place to crash when the bills are soaring,love, love, love.
That relationship is part of why you are here, so it is easier to get it figured out while you are young, so you can keep moving, growing, and not have to come back here again. Just a thought.