Sorry for your loss.Negative for worm's. We did use an actual dewormer on them. The "natural stuff" is just in their food and is for their health supposedly... mixture of herbs and cayenne, red pepper, something like that. The bird died Saturday.
Just in case, I'd like to make you aware that state labs can perform necropsies for fairly cheap and it will give you a definitive reason as to why a bird passes.