Ebay is not a game where you can just change you mind at the flip of a switch once you have ordered something.

Sellers incur fees when a sale happens and it is a great inconvenience to them to have buyer like you as they have to wait to get their fees back and wait some more to relist the item.

Learn to use Ebay properly and have good etiquette when dealing with sellers otherwise you will find yourself on many Blocked Buyers Lists.

You should get the doll, give the seller glowing feedback and put it up for sale yourself.