I can only talk as someone who had them out as an adult...BUT i recommend getting some of those hydralyte icy-poles for afterwards. ALthough they recommend that you try to eat as much normal food as possible (including toast), there are just some crap days where you are too tired from being sore and want to just much something that hydrates and doesnt hurt too bad. That said, eating after tonsils out is kinda like eating when you have tonsilitis...so maybe use that as your measure for what to feed her etc. it doesnt last long and she will feel SUPER amazing almost immediately (as in, i felt super the moment i woke up!), so that will hopefully help her through the last few days of tonsil suckiness.

I can't speak from a mother of kid that has had them out or from the adenoids perspective, but yeah, thought the icy-pole thing was a good one to share