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Perhaps she was medically evaluated initially and was in a much more stable state. Bacterial meningitis can take a mildly ill-appearing child to death in 8 hours for example. Anyone who does critical care work with children knows they compensate extremely well until they can't any longer and crash suddenly....
Absolutely this. To state it again emphatically, kids compensate and then crash rapidly requiring aggressive resuscitation. I've seen it a number of times. As in crashing in minutes to less than an hour from appearing stable.
The intraosseus (not inter BTW as it goes into, not between the bones) Interchange refers to literally is a needle driven into their shin to give fluids. Because by the time they get to that point their veins are basically worthless for starting an IV That's usually not something in a basic aid kit, and usually beyond the scope of most EMTs and is reserved for advanced providers (as a paramedic I regularly use it, though thankfully it's usually not for kids).
As far as the high temperature from what I can read is likely up because of infection, and leading to a seizure. But, during the seizures temp can climb even more due to the muscle activity. And if they're already dehydrated, they can't cool themselves. (It's also possible that the seizures were due to electrolyte imbalances from dehydration, but I'd look at that as the lesser likely reason)
And the single best source of information regarding a child is often their parents/caregivers. I don't know their baseline, so noticing changes is much harder. (Skin color/condition/level of interaction with others, etc). The more obvious signs are late signs, especially in kids. If the kid was up and walking on their own, they would not immediately appear sick to me (let me clarify when I say sick with kids it's not a cold, but an unstable child requiring immediatel diesel therapy and whatever I have time for on the way to the hospital, or not sick when I have more time on scene to assess and treat.)
I'd expect a kid having walked for days to be very tired, and that could mask early signs of sepsis/dehydration.
I do question their decision not to dispatch an ambulance to intercept the bus, as it looks like the decision was made to take the kid to help at the larger station. I've got no issue with them continuing towards help, but a unit coming from the direction *may* have been able to assess the child sooner and request the medevac earlier. It may still not have changed the outcome though.
To sum up, kids ARE NOT just small adults when it comes to management of emergency, and their symptoms and presentation.