More about Frost:
Once an apprentice of Sub-Zero, It quickly became apparent that Frost was a talented individual. Her ego eventually outgrew her skills and she left behind her training with Sub-Zero after feeling she was not receiving the recognition she deserved.
In an alternative timeline, Kronika discovered Frost's talents and tempted her with promises of leading the Lin Kuei to join her ranks. As part of that deal, Frost went through a thorough process of converting her to a cyborg.