I would report it to ebay.
Although they
do allow you to end the auction early in the event it is lost, broken, or damaged. They
do not let you repeatedly end it just because your not getting the amount you want, it is a big No No. Plus what a dummy, she does not get her fee's back either when she does this
Anyways If you do report it I would also state that you have an email to prove that she has written to you claiming "why" she did it.