Orbit can 'fly' to an extent, but it's more like she's pulling herself from one object to another. There are certain places where she can't pull that off, but in a city full of buildings, she's basically slingshotting herself between them. She uses the bike because it conserves her energy, plus, she can carry a rider and extra gear if necessary. (Also, she just likes motorcycles.) I think something closer to full flight would work for her.

I'm thinking about throwing a few new gadgets her way, too. EMP bombs, sonic disruptors... She is almost (if not fully) League status from last time, right? Hopefully that means she gets access to the fun toys.

Also, I know she isn't weak, but she doesn't, and that's really all it takes.