The land of milk and honey is from the Bible...deuteronomy, numbers and exodus I think off the top of my head, don't quote me on that 😜
I find the older/frailer they are the less receptive to change they are and the more fiercely they fight for independence they can no longer manage to sustain. Or maybe my and my partner's families are just REALLY stubbon too!
I hope you figure out a solution or a compromise with her. Good luck, it sounds like you're going to need it!