Ant superhero GM needs a steady stream of costumed miscreants for their characters to defeat, and herein an interesting one is presented... although I wish she'd get out of my back garden and back into the PDF! (It's darn cold this morning...)
Put basically, Windchill's power is based around weather control, specifically air movements and low temperature. It doesn't take a meteorologist to think up a good few ways to create mayhem, although it is not so easy to come up with ways to monetize the abilty, which apparently is Windchill's motivation: to make a buck or two.
The backstory is well-written if a little vague - an inherited power due to Daddy's early work as an ore miner that just sort of began to manifest when she'd already gone off the rails as a teenage vandal, could have been more tightly written so that the original realisation of her abilities was more closely linked to a traumatic event - it sort of is, but the implication is that she was already aware of them before the first blow-out manifestation. The ideas are good, however, and there is plenty of scope for her to cause a lot of turmoil and need dealing with!
Another area that could have been developed further is that before she turned into a hoodlum and developed her superpowers, she had been training to be a dancer. You see how rich the backstory is, yet bits are left underveloped and other stuff thrown in. Overall though it presents a clear picture of promising youngster breaks bad.
The art is good, giving a clear visual image to work with. In all this is a well-presented supervillain who could provide the main opposition for a caper, or provide support for others perhaps as a lead-in to becoming the focus of a plot herself.