Her electrolytes were probably already F’d up when she drank this is my guess.
I usually only put away half this after a hard workout, and half is aminos and half is Liquid IV.
I’m 6’2” and relatively muscular 215.
I do agree it seems unusual.
There are people who are addicted to drinking too much water.
And their lytes are usually in trouble.
The data lacking was her existing health condition. Obviously contributory.