Ditto Dat^^^The symptoms of dehydration are panting and lethargy and unsteadiness. Giving electrolytes and cooling the hen down is what you did, and Queen is no doubt grateful. I'm betting her unsteady gait will have disappeared by morning.
Juicy poop is probably from 'over' consumption of water...
...it goes right thru them on hot days to shed heat from body.
EL is good, but don't give too often once every 4-5 days is good,
and always have fresh water available along with the EL dose.