I wouldn't put the brickmaking and bridge climb in there; at that point they didn't know it was an NEL/there would be bunching/B&N would abort the FF. Still, she probably could've done at least half (I see her having no problem with the nut hunt and the teepee, but Colin did those also).
I agree that both were the kind of tasks that Colin could have done - but if even they both suffered the massive brain-damage necessary for these "BOWLING MOMS WERE RAWBBED" fantasies to work, Christie could have ended up doing them with no effect on their overall placement. I can't believe she'd be that much worse than Kami/Karli at the bricks or that she'd somehow bleed a huge amount of time at the bridge-climb; it's not like there any female unfriendly tasks like the bull-run.