Hi there, welcome
I think a lot of people in this situation will train the bun to hop into their carrier or litter box, then carry them to the table that way, and groom them while they are sitting in the box (or take off the top half of the carrier).
You also might be able to get your brushing in while sitting on the floor with her, especially if you start with a soft brush work up combing. Hand plucking can also work well and is tolerated better by some buns than combing (esp if you pet their head with one hand while grooming with the other).
If she is super into her pellets, you can also brush while she’s eating. Sometimes a little bit of grooming frequently works well, and then you only occasionally need to put her on the table for deeper grooming.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.