And she puts water in the jars, so the potatoes aren't dry, either.
Yes, and she also doesn't remove the skin which according to assumed experts is contrary to their taxpayer funded "research". I can only imagine how much that analysis cost!
This is an ever developing method and technique for canning potatoes and it's prudent to get as much nutritional value out of the them. God didn't make those skins to be discarded.
But, let this matter rest. I'm content with the practical answer from Bethzaring.