It is sad, but your Mother created this situation and has to live with the consequences. If you ever hope for a reconciliation with her, you might consider this approach. Rather than telling her you don't want her at your house, tell her you don't trust her to be there. Tell her if there is any hope of things changing, she has to show a change in attitude and behavior over a period of time. Then again, you may be happier with her away from you. At any rate it is too soon for anything to change for her to be trusted. If you put it this way, it is clear, it depends on her behavior, not yours.
Moni