It Sinon from Sword Art Online... I don't know if you read the light novel yet but she from GGO (Gun Gale Online).... It the arc after Fairy Dance which is showing now on the anime.... I don't know if they will go to ggo, so it kind of spoilerish if peoples see her....
Glad to have you as a friend... Don't be afraid to ask anythings if somethings trouble you.... To answer back go to the profile of the person visitor messages....;)