More nutritious than what?
I just feed a 20% all flock type crumble and feel that's all they need,
except for a weekly dose of EL/Vits during heat waves.
I know you feel you need to do something extra, but patience is the best medicine, IMO
Is she skinnier than your other birds of the same breed?
How are you determining 'skinny' ...musculature around keel bone?
I can't give you a number of days. But as long as she's eating(determined by crop check at night) and has good solid poops within a couple days...the rest will just take...
Should be fine. Not sure about the smaller recipe tho.
I measured out a packet in teaspoons then did the math to get smaller portions,
because a whole gallon was more than I needed.
Probably more because of the heat. They don't eat as much when they are hot and/or dehydrated. Give her some...
I'd have given her electrolyte/vitamins first.
But finish off the corid regime now that you've started it,
then maybe do a dose of EL/Vit.
Small dose recipe in here:
https://www.backyardchickens.com/articles/aarts-extreme-weather-spiel.75893/
Poops could be loose just because of drinking more...