I don't think that is her power, as there was no force or anything else behind it. She was simply telling his wife what she wanted to hear. Much easier to believe an explanation of "mental illness in the family" than "my husband has superpowers.

If Mama Petrelli could MAKE people do what she wants just by touching them, she would have done it with Claire last season, as well as Peter and lord knows who else.

~Aramada