(Urgently)what should i do? I misspelled my Pay Pal's email on Ebay?

I misspelled my Pay Pal's email on Ebay. For example; it could be sunflower74@kk.com instead of sunflower77@kk.com and the buyer already paid for it. She said her account was deducted. What should i do? Now the payment was sent to nowhere or don't know whose is it. How can i get my money back? I don't want to get negative feedback either..should i sent the item to her even the pay hasnt come through my account yet which its my fault to misspelled the pay pal account? thanks in advance!