Her whole town, including her mother, was destroyed because of her father Trigon. That and because her powers are controlled by her emotions is why she is so distant. It's nice to see her open up and even smile every once in a while despite what she's been through.
This iteration of Teen Titans was a really good one. Tho it was based off of actually DC universe characters, it really was unique and yet still felt apart of DC animated series continuity
