Grandparents rights?

My fiancé and I are thinking about moving out of state.. we want to own a house and all that jazz but can’t afford it where we are currently living.. we told my mom last night and she freaked out saying she’d kid nap my son and that she would take me to court for ‘grandparents rights’. Could she actually do that? Like all we really want is to be able to provide for our son, we want to own a home for him to grow up in... it’s not like I’m trying to keep her away from him.