Then change the password so she can't get on the computer. Stop telling everybody the problems and focus on solutions - what can you do to have the life you want? Then do it.
Boundaries are not controlling - her behavior is unacceptable. It's her choice how she behaves but if she crosses the boundary then these are the consequences. The first step in not being a doormat is get up off the floor.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.
