Mallia will be doing what she can, but what she can will depend on what Ben and Mal can scrounge up for her to use as MP batteries. The more they can get her, the more she'll be doing on clearing that path, though she's surely going to be taking breaks to go up to the closest rooftop where gathering energy isn't going to hurt anything, and more or less dropping the temp as low as she can, to fill them. She'll still be fine with handing out food and drink; on-demand is less of a drain than putting out those morning-long spreads. Or if someone needs quick help with something she can give in a pinch, sure....

Also fun: if she really tries, maybe she can be enough of a drain on their power grid to cause a brief blackout? XD

Edited to add: she'll be happy to hand out magic energy drinks whatever she can, of the energy she's collected, if someone wants to try using some. She can put it in water, if that's all that's available to store it in, though water can't hold much of it. Non-magic-users aren't going to get a ton out of it aside from something sort of akin to the mental effects of caffeine (wakefulness, help with focus and clarity) that'll wear off after a while, since lbr here, it just won't last indefinitely... but if someone does have magic use, it's basically an MP refill (or possibly temporary overfill?) item. ....Alternately, if someone wants a bit of it on the spot, she could just transfer it directly to them, too....