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Definitely need to talk to an attorney, because this could easily vary by state.
For example, in my state, two parties can sign separate copies of the same document and be perfectly legal, even if one copy is an image, it is called "counterparts", so that part would be legal IF the copy she signed is identical to yours. If she made changes, that is a counter offer, and it isn't legal without your initials on the changes.
However, in my state, contracts have to be signed by both parties, and if one party rescinds the offer BEFORE the other party delivers signed paperwork, the contract is void, even if the other party then signs afterward, so the contract would not be legal. Especially if there are changes you haven't signed off on.
But as I said, this could easily be different in your state.
Again... REGARDLESS of the legal status of the lease
it is still not some sort of indenture.
You can leave anytime you need to or want to...
if you're willing to risk having to absorb some expenses.
In CA those expenses will be less than almost anywhere in the US
because of the duty to mitigate costs statutes and case law there.
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From the other end:
Tell the LL that you're buying soon and see how quickly
they decide that you have a binding extension or not.
I suspect they'll say if you're gonna go then go now. right?