http://hosted.justteensite.com/gallery/4/1073/ccbill/0000000/Chapa
Margarita (JustTeenSite)
http://www.justteensite.com/model/665/
Did not recognize her from other sites.
I'm currently looking for further information about her also..
Only found one other than JTS site, she's Neya in MPL Studio Girls
http://www.mplstudios.com/assets/studio_girls/neya.htm