Ferrets need to be in pairs to be healthy. They need companions. Try wetting the food down with warm water until it becomes mush.
If she continues to not eat, you need to take her to a vet. It's dangerous for animals like ferrets to be without food for that long. In the mean time though, yes, think about holding the other ferret at the store because she needs a buddy.
I hope she gets better though! Make sure to get her help asap if she doesn't eat tomorrow!
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