Sally is a little girl protected by the Slender brothers - excluding Offenderman. She has a high, child like voice. 

*SPECIAL* My version of Sally is that she's more mature on the inside then she lets out. Basically instead of her perpetually being a child, she simply acts cutsie out of fear for Slendy deciding she isn't worth protection; and tries to stay on her good side. In all reality she's still experiencing new things and able to learn and mature so I don't think she is mentally stilly eight years old.

Line One: Being cutsie around Jeff, Splendy, Slendy in order to gain their trust more.

Line Two: Upset, crying, 'What if Uncle Johnny comes back and hurts me!!'

Line Three: talking to Offendy, very serious and mature sounding; yet her voice sounds like a child.