Hi, yes it is a part of the paranoid disorder where patients find an obsession towards certain objects, habits or even people. This behavior can be rectified by taking her for counseling sessions because she would given therapies which will work as a reference for her immediate support system and they can practice it at home to curb such a behavior. So I would you to take her to a counselor near you who is experienced at providing therapies (clinical psychologist) to clients with clinical disorders.