Contact Ebay. If they don't resolve the problem, you can also contact paypal. Ebay should be able to resolve the problem. Don't leave negative feedback until you discover you will never get the machine or one exactly like it. Then leave negative feedback and post it on facebook, here, and anywhere else people who know what you are talking about would see it.
If she had a minimum she wanted, she should have started the bidding there or used the part of the program where she has a chance to not sell if the bids are too low. She had options and relisting isn't one of them