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Is this a new symptom today or how long has she had this numbness and lack of use of her right leg?
Is it her right arm that is affected as well?
Looking forward to continuing our conversation,
y wife has had this symptom for over 3 days and her right arm is affected as well.
I'm sorry, but she needs to see a medical provider to learn the cause. One possible cause is a stroke and she needs to be evaluated for that.
There is no way to tell what the cause is without a hands-on examination and some tests, which she needs to have right away.
Any one-sided weakness needs to be evaluated on an emergency basis because a stroke is the most common cause of that symptom.
Please let me know if you have questions,