What should I do about my realtor who screwed up conveyance of parking spaces in the sale of my condo?

I entrusted a realtor to handle all aspects of the sale of my condo, including the choice of the settlement company and the title company. After settlement, with my realtor there with me, the buyer went through the settlement documents very closely and discovered that my realtor’s settlement company had mistakenly conveyed two parking spaces from my first condo instead of just one space from my new condo, as I had clearly instructed my realtor. Throughout the entire three months of the listing, the condo was advertised with just one parking space, as I had instructed my realtor. I trusted my realtor to choose and work with the best title and settlement companies from her extensive realty experience, since I had no idea how to transfer the two parking spaces from the condo that I was selling to the condo that I had just purchased, in exchange for selling that one parking space from my new condo along with the condo that I was selling. She failed to do this and left me holding the bag.