If it’s value that you whole heartedly believe in, I don’t think it’s good for a partner to ask for a compromise. There are things that couples should and often do compromise for, but not for major values which it seems like veganism is one of them for you.

I also tend to think that is sort of a small step for her to see that you would be willing to consume animal product and thus maybe in the future, will ask for even more.

I guess i can’t really see her side of it either. Is she just embarrassed because you can’t eat what she’s and the others are having? If she wanted to be supportive, she’d probably share the vegan meal you’re having. It’d be a way to further influence others that having a vegan opinion should be considered.