Sorry, I didn't mean to scare you. Sissy recently went through some mild dehydration an it is scary to see how lethargic she got so fast. If you have a basic syringe from past medication, I would give her 1/2 tsp (or 2.5 ml) every hour - if you can) until she starts eating/drinking normally. When Sissy dehydrated, the vet gave her subcutaneous fluids and an anti-inflammatory injection and within a couple hours she perked right up. But she continued to not really eat or drink for the next day, so I did the pedialyte via syringe (once I had the syringe). The orange flavor should be okay.
Your vet will advise on what/when to feed her, but the boiled, plain chicken and plain, white rice (not instant or quick rice) works well. She might continue with the diarrhea or she might not. It is hard to tell when the little tummy is upset. I'm sure she'll be just fine. It is very hard not worry
