One of secret experements by making an intelligent deatchclaws to use them for war, Susie was one of succesfull experiments she was pretty smart, can talk,use weapons if needed but still they couldn't completely take down her basic wild instincts so she could act pretty wild sometimes. After laboratory she was created in was destroyed by Brotherhood of Steel she manage to escape it but since all she saw was a laboratory walls it was pretty dificult to survive out in the wilds of course some of her instincts still helped her a bit but each time she see an traveler and tried to approach and talk they usually just screaming and running away from her.
