Here's a slightly less rough draft of Mecholithi's history... I'm pretty flexible about it if anything needs to be changed to fit the game.
Mecholithi was born in Harrowdale, the conservative country atmosphere was an ill fit from the start. Her parents are both clerics of Ehlonna and have chosen a quiet life of introspection and contemplation. Her eldest sister has followed in their footsteps. The middle sister is a sorceress, and like their parents, enjoys a peaceful life full of simple pleasures. Mechothli was a constant trial to her parents, who loved her greatly but did not understand her. The question, “Why can’t you be more like Meneltarm and Malinalda?” was oft asked by her parents and the others in their village.
Frustrated at their inability to mold Mecholithi into their quiet life, her parents sent her to Silverymoon and her Aunt Eissabelth. Eissabelth worked as a mercenary and was able to give Mecholithi the skills to protect herself when her constant quests for adventure got her into trouble and instill in the young elf a sense of discipline and purpose. She fought and trained with the company until her aunt retired, and then began doing freelance work.
Ironically, shortly after Mecholithi left the provincial region, Harrowdale Town became a significant trading post. Bringing visitors from the outside world and new ideas to Harrowdale.
Aunt Eissabelth retired about six years ago and Mecholithi began doing security and guard work both for the city of Silverymoon and for individual patrons. The skills learned for battle and high adventure make her a fearsome warrior; the discipline and loyalty to one’s employers learned from her Aunt and the other mercenaries make her an excellent bodyguard. Like many other aspects of her life, Mecholithi tends to take her work very (some would say too) seriously.
She has not heard from any member of her family since the troubles began.