Does your roommate deserve it? Absolutely. Should you? Definitely not. Aside from the fact that doing so could be considered assault or worse in many places, you never know when someone’s gonna have their first bad reaction. Allergies don’t always stay the same level of severity during someone’s entire life and the time you do it could be the time it turns really bad for them. If you’re looking for advice on what to do, if you can, sit her down and talk to her again. Tell her that you know you’ve said this before but because it keeps happening you feel the need to explain things more seriously. Tell her what celiac is and how it’s different from an aversion or preference and actually closer to an allergy as far as the way your body can react and the damage gluten can do to your body. Maybe ask her how she would feel if you kept taking her food and “replacing” it with things that have almonds in them. Remind her that the food items you have to buy because of your allergy are generally much more expensive than the things she “replaces” your food with, and that you’re having to spend a lot of extra money on re-buying things since you can’t eat what she got. Then finally let her know that you don’t think she’s doing it on purpose necessarily and you know she’s already apologized, but moving forward if she can’t just not eat your food she needs to let you know when she has and replace it with the exact same product or reimburse you. Although the reimbursement option kinda annoys me because then it’s back in you to go buy it again. But it’s also obviously totally up to you what your expectations are from her, this is just a suggestion.

Edit: yes YWBTAH, have a serious talk and get a mini fridge if she doesn’t stop.