Hello. Late to the thread.
1. Good sign she's eating.
2. I agree that a vet makes sense.
3. To the best of my knowledge, poop samples are good for about 24 hours +/- to be able to see all possible parasites, bacteria, etc. There is a little flexibility, but not 5 days worth.
Absolutely no need to go trash digging!
Welcome to the forum and let us know if you need help with anything else. Also, please let us know what the vet says.