I'm guessing that the problem is rooted more in the location of the food and eating on a college campus. While our children are in K-12 they go on college campus often to their grandfather or father's office or to a community event. It's nearly impossible for us even as parents experienced in negotiating food in K12 schools, camps, movie theaters, the gym, airplanes, and so forth, to really negotiate a college campus with them because food is being consumed everywhere there's no real management without any clean up whatsoever.
Because I go to a college campus often with kids who have LTFA I just wanted to say that to put myself in OP's daughter's shoes, this may not be the case for daughter what it comes across to us on a forum. We might think it's smell based on how this is written but when you walk across the campus it becomes really evident how food filled it is compared to many other places. Particularly the trail mixes and peanut items because they're portable, cheap and sold (and consumed) nearly everywhere. I'm not convinced that the anxiety is tied to smell despite the compensating behavior making it appear to us as if it's smell.
To boot, it's not uncommon for the smell to actually be from heated peanut. Food carts and courts are perfect places for peanut sauces, hot food with peanut - unlike schools that serve PB. There may be a mix of that on campus where OP's daughter doesn't have time to consider is this just harmless PB smell or is this from the satay cart that I wandered next to without noticing?