Her powers gave her the ultimate understanding of gadgets and weapons. She is the weapons expert of the team. Not only that but she is also the most combat experienced member of the team. She is also the only member of The Brain Busters who kills zombies the old fashioned way, by using weapons, melee or long ranged.
Check out my original sketch of Ingrid. She was supposed to have shoulder pads similar to her metal band and knee pads, but in the end I decided not to include it anymore. She was also supposed to have tactical goggles, but I thought the combination of the bandana and the goggles isn't right, so I decided not to include it in the final piece as well. I tried to maintain casualness (not too techy) so that she will not be too different from the other "busters":