She probably misses being up high on the counter and doesn't like the new perspective. I would say at 10 months, she can just go in the regular bathtub, if you have one. Just fill it a few inches and kneel on the floor so you are eye level with her and wash her.
My son has never played in the bathtub or been in there for any length of time. I can have him in and out of the tub in literally 4-5 minutes. Why prolong it if you don't have to. They just need to get clean. They have all day to play. ;-)