Hey there.
I consider my DS to be a really good eater, but even he gets fussy if there are teeth on the move.
I would personally give her what she wants (it's all healthy, not like she is asking for candy) and continue to offer something on the plate at the same time so that when she is ready for her veg and other foods there is something there for her to try.
For me the main thing is that food is healthy and meal times are stress free for both me and LO. I had a time when I really had to limit fruit intake as it was getting excessive and there was a risk of tummy trouble with that amount yk? My LO wasn't all that pleased about it but I talked him through calmly and was supportive and understanding of his tantrum of frustration. I explained I didn't want him to get poorly.
I think the variety in diet will return for your LO when the teeth are less painful.
xx