I'd tell her that a gramma that can't respect heritage is never going to see her grandchild ever again.

In baby talk.

And I'd probably tell the old bat to STHU. But I don't recommend that you do this.

I do know what I would have done though. First words out of her mouth I would have escorted her to the door and told her to get the hell out, and don't come back till you get some respect for your own flesh and blood.