I would keep an eye on her and see how things go. Duramycin won't hurt. I usually use just a weak dose and have really only used it once or twice in all the years I've had chickens. Watch the humidity in your coop.
I rarely use it but keep some in the fridge just in case. I would watch her and make sure she's eating and pooping. Use a high protein feed.
Of course you have to do what you think is best so if you don't take my advice that's okay. I just want your bird well.
IMHO, I think the reason for all the soil erosion on farms is lack of real soil. Too, I think the desire to eradicate every weed is too much. A few weeds won't hurt. There is a natural balance that is lost when adding so many chemicals.
I have read that the percentage of increase in yield using chemicals is negligible. It increases the cost of the producing a crop. Might as well dump on lots of horse manure and save money.
Besides horse are nicer than a chemical plant. Can't ride a chemical plant. Can't hug,nuzzle or kiss a chemical plant. When's the last time a chemical plant acted happy to see you?
Okay I'll stop.
To butt in on your other conversation. There is soil erosion because farmers keep farming more and more areas that really should not be farmed, like hillsides. they do not even bother with creating terraces here. But soil, and what should be in it, is one of DH favorite subjects. Today's farmer does not care about soil health, they literally talk in years, "I have 10 more years to use this land, then I will get rid of it" figuring that is how long planting the same crop and fixing the soil with chemicals will work.