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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.
Since when is she limping?
Is there any swelling, redness, tender point?
Did she have any trauma, fall?
Thank you for the input.
There can be different causes.
There can be a foot or ligament strain.
Arthritis can occur in children.
I would advise to get an examination by doctor.
She needs to keep the foot at rest.
Motrin can be taken.
Warm application can be soothing.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish her healthy life.
As you did not mention the age earlier, I thought she is older.
She needs an examination in person.
Any neurological issue causing weakness needs to be ruled out as there is no pain.
I would advise to take her to an urgent care for at least an examination.
Without knowing the precise cause, you can not do more than what I suggested in my first answer.