If you had a peanut allergy would you eat peanuts to "not hurt their feelings"? NO! You have the right to protect your body from crap. Be kind and stay away from the dessert table. She will never know and if she asks if you had some, say," I am afraid I should have told you that I am also gluten intolerant and those brownies, even though they are sugar free are loaded with gluten/flours." I hope you understand why I cannot eat them. They look lovely and I am sure others will enjoy them while I cannot."