That is the evil eye. He is attempting to put a curse on your mother. He has cast a satanic destruction, death, spell.

She should call on the power of god for protection. Pray to god to bind the evil cast it out and send it back where it came from.

The cresent moon also represent the aging goddess Crone. The circle represents female a;so represents world serpent, eating its tail.

The pins in the dolls head is a destruction ritual.

You are right about what he is attempting to do but things like that do not have power unless you give it to them.