She would start by quoting Proverbs 16:18. “Pride goes before destruction, and a haughty spirit before stumbling”. Then she would more provocatively cite 1 John 2:16,17 because, well, grandma isn’t intimidated by how other people might react.
“For all that is in the world, the lust of the flesh and the lust of the eyes and the boastful pride of life, is not from the Father, but is from the world. And the world is passing away, and also its lusts; but the one who does the will of God abides forever”.