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In Bell's Palsy only one side of the face will go limp (never both sides). Also there will not be any numbness or weakness of of arms and legs. I would like to know some additional details from you so that I can provide a solid and learned opinion.
You can reply as a followup.
1. Is she having trouble in closing an eye ? If so which eye ?
2. Is there any weakness of arms or legs (trouble in raising arms, trouble in sitting up ? difficulty in climbing stairs ?)
3. Is there any trouble in passing urine ?
4. Is there a deviation of angle of the mouth ? If so to which side ?