Nope. The flute belongs to the seller and she can do with it as she likes until it belongs to someone else.
FWIW, she obviously was willing to give up a sure $20 sale for a possible $25 sale, a silly move, in my opinion.
And wait over a week for that fantasy sale.
From the less popular 10 day listing instead of the most popular 7 day listing.
And she doesn't realize that most auction bids happen in the last few hours or even seconds of the auction, and she lost those potential bidders as well.
So please join me in repeating the words of a great philosopher:
https://www.youtube.com/watch?v=hxGgnI6kCrs