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Hello. I'm sorry to hear about your dogs.
I would agree that Parvo sounds likely. That is especially true if she is unvaccinated. I think it's her age that has allowed her to survive this long and what makes it less of the textbook parvo case.
To get her through the next few days, she needs food. I would get some canned puppy food and blend it with water. Try to get 1/4 can into her every 4 hours. She may vomit some of it, but she should still keep a decent amount down. Calories getting down to the gut and intestinal cells are what is needed to get them to heal. Continue offering pedialyte and water as you have been doing.
To help with the nausea, there are 2 over the counter meds that can help:
1. Pepcid AC (Famotidine)- give 10 mg twice daily
2. Meclizine- give 25 mg twice daily for nausea
I hope this helps. Let me know if you have any other questions.