She may need to be seen by a vet. It may be a bruised foot or there may be a break. In any case, she's in pain and a vet can prescribe a medication for that if needed. Please don't try to medicate on your own. It may be the wrong med or the wrong dosage. Bird metabolism is much different than ours and dosages are quite different.
If her foot is broken, the vet can splint it properly.
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