I accidentally fed my vegetarian friend non vegetarian food

I feel awful and I haven’t told her, she was hungry and I offered her a Kraft Mac and cheese cup I thought that it would be fine because other Mac and cheese cup brands are vegetarian. I was looking up the ingredients at night and saw that it wasn’t vegetarian and I don’t know if I should say something because she enjoyed it and I don’t want her to make herself sick.

Feeling like a terrible person 😞