I'm not sure they'll make her more powerful, though I think there is something odd: at first, she would make things explode from the inside out, by amplifying their vibrations. But now, she's pushing things, like that SUV she tossed, or the quinjet in the previous episode.
Maybe she can do that by making the air vibrate? Or maybe she has two powers?
I don't know; it seems more likely that they're rewriting some stuff. But given the powers she's shown so far, she should be able to still use the power to make things explode, perhaps focusing on Lash's eyeballs or something like that.
As for her physiology, all we've seen is that her heart can go up to about 300 bpm without negative consequences for her; if she can do that without using her power - which now she may be able to -, that would give her a boost in some of her physical abilities, even though nowhere near Captain America. I don't think they're aiming in that direction, though.
She is making the air vibrate .We have seen her do it before to Bobbi and Agent ******** in the woods and when she pushed the jet off the carrier.And we have seen her vibrate water as well



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