Thank you illys/elisah for all those suggestions! We have started some broths. I'll try some EOs on her feet.
She is doing a lot of resting. The couch has become her main spot while she watches endless cartoons. :( Audiobooks and music would be a much better choice. :)
I'll watch out for signs of hypoxia. She is still coughing and throwing up so much throughout the day and night but the whoop sound, which happens when they are desperately trying to suck in air, has diminished quite a bit so that's good.