your ideas sound great! unlike ren who's more internal with his abilities, she's more external in terms of levitation/telekinesis, force fields, etc. she's had a little bit more training on how to control her powers than her brother, having lived under the disciples and them forcing training upon her and their so called "recruits". she's there, but not yet there. they've also taken a large chunk of livelihood from her when they slaughtered her parents in front of her. it was the cult's way to jumpstart her abilities per se, to see if she really was a neurogenic.
so yep, she's a little firecracker. if she doesn't know you, she's a mute in the beginning. ren will speak on behalf of her. but once she gets comfortable ... did i mention she has an eidetic memory? vash needs to prepare for "riley's never ending fun facts".