I wonder how evenly matched her and I are?

I'm not sure if I've got this right, but I imagine I'm gaining some power from the sun hammering down on the arid desert floor while she is gaining power from the massive volume of water in the facility.

Either way, I think this is about when I start getting tuckered out. Can't just chuck fireballs willy-nilly and then do some flamethrowin' while running like that and expect to not need a moment to catch a breather.

Whatever. She's still fresh for the fight while I've already brought my milkshake to the yard. Could use a little reinforcement.

you are effectively correct, but some pointless thematics for you (feel free to ignore, I am just compulsive about explaining this stuff). To use some arbitrary numbers, the hot weather doesn't give you a +1, it gives everyone else a -1. The heat fatigues and dehydrates people faster, but you are completely immune to these effects.

Your enemy is suffering opposite, and the same issue you'd have in cold weather. She never needs to drink and could keep herself cool because she has an infinite supply of water. But doing this constantly taxes her powers abit and makes her more prone to fatigue, having a ready water supply and drinking it like a normal human would offset this.

As for her power level, taking away elemental advantages and disadvantages, one on one she is more powerful then you guys. She simply has more experience fighting and developed more E. Tech. If you guys are smart two of you could take her. With elemental advantages, Alice + someone would be about even, and Alex alone would be a match for her.
actually, yes you can. you have an infinite supply of fire to throw at her. Though running would tire you as it would any human, so depends on how good a shape she is in, but it wouldn't limit your ability to produce fire. Only regenerating with your power fatigues you.

Now I might limit it abit later, but you guys aren't using your powers anywhere near where I'd feel that was nessicary