This perhaps can really happen to people, evil spirit can manifest in different forms. On the other side of the coin there is something very good going on in her family, is the reason to why this evil spirit would come & do this. It is spiritual battles that r happening all around us & many times we do not see or feel it, but it is there in many forms. Usually when good spirits come, or something very good & spiritual is going on the bad spirits will come to confuse things, & it is because they r unhappy that in some way ur connecting with the other side, the good side. Spiritual ware fare.
What should u do, prayer is what u should do, pray for help, & protection, & the good spirits will come & help u to defeat the bad.