That was wrong for her to do this to you and she should not have charged you, except for shipping it back to you. She broke her contract with you. And since you are moving there, you could pick it up at her place then.
You already paid her. but it would be good to find out why she couldn't complete it.
If the center is done, perhaps you can do FMQ or leaves on the rest of it. There are many good instructions on UTube. Practice on sandwiched pieces first, before doing it on yur quilt.