A well meaning relative did something similar for DD. except that my complaint had been that I loved a certain pair of shoes and was upset that they didn't come in DD's size (except on eBay).
The relative was trying to be helpful and bought them in a too-small size.
I called the shipper and they provided free return shipping and let me replace the item with something I wanted without the relative knowing (woot diapers.com!)
Anyways, if it came from the shipper - call them. You might be surprised. If she sent it directly, then I'd return yours and get something new from her like previously suggested.
SAHM to Magnolia May (09/10), Luke Russett (04/13) and expecting 11/16. Wife and best friend to my airman.