Marian is back in the feels-like-four-am state, except she doesn't think it's even close to four am yet. It's just been a stupidly long day and Leareth is such a frustrating patient. It's not his fault at all, his body is just in terrible shape and every time she thinks they've solved one problem for good, a new one shows up. The Andalite technology plus Healing magic is really good; he's not going to go into kidney failure from all the damaged muscle breakdown even though he sure did give it a try. (Marian knows he didn't do any of it on purpose, she's just being snarky about it in her own head.)
For a while it seemed like he was improving; she was down to fretting about non-life-threatening problems like his entire digestive system being on strike, which she cannot blame it for at all. But he's - kind of worrying her now? A lot of numbers are getting wacky at once, not that off - yet, some part of her hindbrain worries - but she doesn't like it. His oxygen levels are dropping despite the REALLY COOL Andalite tech for getting oxygen to his blood, humans sort of have that on Earth but it's still pretty terrible and unsafe.
She wakes another of the Velgarth Healers and summons the Andalite doctor. "Nothing looks that horrible yet or anything, just, he seems worse and it's making me antsy."