If it were me I'd give antibiotics and vitamins a shot. I don't know much about making electrolytes so can't comment on that. But if you do know it could help. Hopefully someone with bumblefoot experience will hop in.
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It certainly felt hotter than 78 to be fair. and it was humid. google said 86% humidity. it said real feel for the weather at 34.I use nutridrech for vitamins. Great for them if their off feed. I converted the temp and that's not dangerously hot but I see mine pant anything above 78 F. So heat don't think is an issue but electrolyte still can help I'm sure
I had put her in an underground garage, where it was very cool, quite pleasant in fact and thats where she started going downhill.Where I live also ranges at those humidity levels a good portion of the summer. It can make temperatures like that feel miserable. Maybe adding to the stress. Can you get her to a cooler location?