I usually just scramble up an egg and provide it separate as a "treat" but you certainly can mix it with her feed if you wish.
Hopefully she's just injured her foot and it will take a little time for her to improve.
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You mention she stretches her leg and it trembles. This could indicate a neurological issue or disease.
I'd try giving her 1/4 tablet B-Complex daily along with 400IU Vitamin E. A treat of egg daily will help with the uptake of E.
See that she's eating her normal feed and...