Ai, robotics, nice art, cool characters with nice personalities and an interesting premise, this seems like it's going to be a pretty nice read.
And I'm suspecting that she's using an interface to transfer her movements to the robot, as even with current technology people can move virtual limbs by just imagining their limbs moving (though from my knowledge those work by sensing micro movements of the user, but it nonetheless it should still work to some degree). Also, currently in virtual reality a locomotion problem exists, where if users want to move in the game world they have to move in reality, and even if we had a brain to computer interface there would still be a problem of preventing the body from moving. However, our wheelchair girl isn't limited by that (for her legs at least). Assuming that she is paralyzed due to damage to the spinal cord and not brain trauma, then it would be possible to translate her signals corresponding to movements of her legs to the robots legs instead (also note that on page 8 it states that the robot uses artificial muscles instead of motors so it's highly likely that's she's controlling it that way based off the info we've been given).