How exactly was she made into a hybrid and why was she used? Do they use relatives?

I think its so they wouldnt bailout in the middle of the fight because it keeps them there and they have more determination to fight ╥﹏╥ the god damn government got human emotions down to the dot

(╬￣皿￣)凸(￣∇￣")*

I think it might be because of dna? Like it has to be someone related to you by blood for it to properly work.