I very well understand the problem your family is facing. She needs a consultation with a psychologist
. Usually Govt. Hospitals have a Clinical psychologist. She needs a thorough analysis of her problem. It may even be necessary to have hypnotherapy
. See if it is available nearby to your place. Try not to scold her, as it may exaggerate the problem rather than reducing it.
Wishing you and all your family members all the Best.