It's highly possible, yes. Do you think she got to it?
If you do, just give her a gentle cleansing mash first thing tomorrow and take precautions the following week. Mash ingredients are below.
I wouldn't wait for symptoms. But definitely if you see the following she's gotten into soured feed:
diarrhea
ataxia (walking like drunk)
neurological signs: weak wing, limping, weak neck
vomiting (sometimes)
To help her, as soon as you can I'd offer her the following mash.
The goodies:
1 teaspoon of yogurt (replaces good bacteria)
1/2 teaspoon of baby food applesauce (cleanses the gut)
1/8th teaspoon of molasses (flushes toxins)
The base (which ever you think she's more likely to eat - I put them in most-likely order):
The yolk of a boiled egg, mashed.
Cooked oatmeal.
Crumbles moistened with water.
Mix The Goodies in with the base til damp, not wet (unless she likes wet). Take her feed up 30 minutes before - then give her this. She'll be more likely to eat it.
If you see any symptoms, you m ight want to do a stronger flush; update THIS thread as you'll have subscribers (including me) looking for updates.
Otherwise, just watch her. let us know how she does, please. Also if the feed was in your bin, replace all the feed. Before you put the new feed in, white the bin's interior with white vinegar. Let dry. Then replace the feed. That kills spores to prevent risk of mildew/fungi/aflatoxins.
I hope she's well!