C.B.
My daughter had this done at about your girls' age. There were a whole bunch of kids her age having it done at the surgery center, I guess Thursday was tonsillectomy day. I was able to walk her into the operating room, where a nurse asked her to blow up a balloon (attached to the gas) so she would breathe heavy. I held her hand and told her cheerfully I will see you soon. The doc did advise me that once they go "under" their eyes roll back and not to feel scared about this. When she was done about 40 minutes later they called me while she was waking up. She was a little disoriented, but the room held about 5 other kids in the same condition. I fed her ice chips in the post-operative room for about half an hour to 45 minutes. Then they moved her to her own room, since we stayed overnight. The worst part of the whole experience was me having to sleep in what they deemed to be a "pull-out-chair". It was so skinny and hard I barely slept but we watched tv until late, then I read while she slept, and then I woke up early again and shared her huge breakfast while she ate more popsickles. The risk of a tonsillectomy is mostly bleeding from the tonsil beds, and that risk is greatest right after surgery and then again about 7-10 days later when the scabs fall off. Nothing at all happened to my daughter, she loved having ice cream with every meal, took the tylenol with codeine in the hospital but at home wanted only tylenod (the codeine has a funny taste). She was fine from day 1 and immediately did not snore anymore. The surgeon said her tonsils were a level 4 which I understood to be the largest. They were so big they actually grew up into her nose cavity, not just in the throat.
I would not bother with a sleep study, that may actually be a lot more scary for her with electrodes attached to her skull and skin and trying to fall asleep in a weird place.