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If you know you're buying a new place in 6 months, then (and this is horrid advice to give) I would do my best to wait it out, then tell her she is not moving into your new house.
As for how to grin and bear it, if it is financially possible for you to do so, then at least that problem is solved. If it is not possible, do you have other siblings who can help you out? Failing that, it is possible to see about getting out of your lease early?
In terms of personal boundaries, I have had to spend months with my mother before here I had to treat her as though she didn't exist - it was the only way to protect my sanity (I've done this with roommates as well). It's not the best solution, but it worked for me when I knew there was an end in sight.
I wish you much luck and strength. Sorry I don't have anything better to offer.
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There are no great deeds; only small deeds done with great love. ~Mother Theresa |