Should I worry about the way my chickens are dying?

[Wyorp Rock]

Thanks so much for the information. Unfortunately she's going downhill fast so I will do what I can for her but suspect I'll need to put her down soon.

I'm sorry to hear that, sometimes they can go quickly.
If you can, get a necropsy to confirm what you think may be going on or if that's not possible, consider doing your own informal one.