Sooo, her super power is to shrink to mouse size? Just to shrink? Hm, I don´t really see how this is usefull for fighting crime, I mean the wasp can at least also hly and shoot her stinger beams but just shrinking?
Well, nevermind, I´d still keep her.
I´d take our old, sturdy, lock-secured gerbil cage out of the basement (our gerbils where escape artists, there is a reasom why we called those f*ckers "Harry" and "Houdini") and keep her on my desk.