Serious response, even if I'm just echoing what other sensible GAFfers have said:
Box her stuff and put it outside the door. Double lock or chain the door so she needs to knock. Don't let her in, because this will lead to discussion and your will may dissolve when confronted with her emotional response.
Answer the door and tell her what is happening. It is non-negotiable. She has lied, betrayed and used you, and was planning to leave you anyway. From the email, it appears you were going to provide her with comfort for an extra month or so before she broke it off with you.
You are simply speeding the process up on your own terms.
This relationship is over, you cannot trust her again and she is already planning on leaving you. There is no chance of this working, and for her to move back in would be living a lie doomed to failure.
This is going to be hard, miserable and lonely, or at least it is for many people. That emotional fallout is usually inevitable. But I implore you, approach it on your own terms and not hers.
I really hope this works out for you.