She loses her hold on each individual piece as it gets rewound, and simply doesn't grab them again if it'd cause damage. She does trip the villain again, snickering.
She stops flying and waits for someone Official to arrive so she can explain what exactly happened.
The shopkeeper starts explaining the part where the villain calmly walked into the store and touched the people there, making them disappear, before pointing a gun at him and lazily grabbing jewelry and putting it inside a black bag.
When he's done with that, Mountain continues, "I fused the gun then tried to immobilize her, but she just flickered around it. Did not know her power then but she ran at me so I assumed she thought it could hurt me - I flew up. Then I stopped her from taking anything by moving the jewelry around and hit her with rocks not too hard until she gave up. Those people okay?"
"Seemed like reversing time or something? She put things to where they were when she touched them. I'm not sure on the details." She draws the rewind symbol. "This was on her costume."
"That is very suggestive! That symbol is used on media-playing devices to indicate a command that will return the media being played to a previous point. Hmm, if she just turned those people back to wherever they had been earlier then that is not as worrying, they are probably fine, but the Protectorate should be informed at once."
"Hm, she'll be hard to catch if she can just go back to where she woke up or something. I have a phone, should I call them or will you?"
"I probably won't do this kind of thing very much, I am just so bored since I am still not allowed to sell things. So much paperwork."
Off she flies, restlessness satisfied.
She arrives precisely on schedule for the second round of power testing.
She can totally repair crumbling abandoned buildings. Or are they asking her to topple them? Either way.
She puts that rogue's assistant job ad out for real now.
Any news from the engineering guy she hired to help design her own personal power plant?