Given her powers, I think she could defeat anyone so long they don't have invisibility powers and IF she can tag them with her time energy. Provided their lifespan and durability aren't unlimited.
Flight: The ONLY speed she flies at is 50 mph. She can stop on a dime though without injury to herself.
Dense tissue: Her body tissues and skin are extremely dense. So impacts that would kill a normal human bounce off of her.
Strength: She can lift heavy stuff like cars with ease.
Utility Belt: Carries small tools and weapons. She has a variety of small pellets: cryogenic, knock out gas, and a few blast pellets.
Time Manipulation Powers: She throws energy balls. They look like red and green energy with funky black stuff.
Even if the target is hit, the effect is dependent on the target being in her line of sight. If it leaves for even a moment the effect is broken.
Red Energy Effect: Stops things with a red energy time field on contact.
Green Energy Effect: Increases the age of the the target. How fast? Seconds become years...that's how fast.