There are picky eaters and there are people who turn it into everybody's problem. I'd reserve judgement here.
NTA.
DIL is TA.
There's nothing worse than being the only person invited to an event where you dislike the activity. In fact, if anything, it is an insult, since it shows the person doing that inviting doesn't really value you as a unique individual.
The OP should have answered forthrightly, but the DIL should know it was an act of respect to not invite her to something she'd hate, and respect for the other guests who would have to deal with the awkwardness.
@jezebelkat @georgetakei agree. It’d also be an insult to the chef who carefully crafted the meal for her to not touch it, and also unfair to another eager patron from whom she’d take the coveted spot.
Just like she shouldn’t be upset to not be invited to a baseball game if she think it’s the most boring sport.
OP should, however, plan another event that the DIL does enjoy with the same group assuming she just wants to feel included.
This is exactly the metaphor I was thinking of.
Well, soccer, in my case. I can't stand the sport. Have all sorts of quibbles with how it works. I spend the entire match thinking about it. It would be cruel for a family member, especially my father/mother in law, to invite me to a soccer game.
I'd feel an obligation to go, be quiet the whole time, and I'd be miserable.
We don't know DIL wasn't invited to other stuff. We only know the context of this event.
@georgetakei
Yes, MIL is the AH.
She clearly hid the fact that the DIL was left out. Then lied when asked.
The better approach would have been to call the DIL upfront, explain the event, and ask the DIL if she would be interested - given the avant-garde food nature and her disinclination towards new foods.
If DIL still wants to go, maybe consider that she just wants to be included as part of the family - and be grateful that she *wants* that.