What is going on here?

A girl and her friends have been held captive by the Kraang for several months, when the girl finally escapes. One problem though, she sticks out. Donnie, Leo, Raph,Splinter and Mikey take her in, not knowing what they're getting themselves into. Some questions arise though..... Like, who is she? Where did she come from? Is she even from this world? These questions, not even she can answer....