You have a Fantasy Filly!
They were by Marchon, and I think came after the FSFs. They came in 2 sizes: minis and regulars. You have Alexis the regular size unicorn, "Long Horn" version...and she is one who I need! Are you trading or selling? I've got trade-able MLPs, or if you're trading for other FF's or FSFs, I've got Haley and a few Fashion Stars.
To learn about the FFs (there were a bunc) this site here is handy:
http://www.fantasyfillies.com/It's a fan site, but it seems really complete.