Do you and your Mom live together? When puppy is with Mom is it a different place? You will have heard that "dogs don't generalize well." That means that just because they learned something in one place (to pee, to sit, etc.) doesn't mean they know to do the same thing in a different place. That might be part of your problem. Mom has to potty train too, at her house, or you do.
Coupled with that I'm thinking maybe Mom is not as observant as you. Mom is missing the "need to pee" clues.
Are the carpets clean, was there ever another dog peeing on them? It can be hard to get residual scent out. Can you get Nature's Miracle? Failing that, vinegar might help. But carpet is awfully hard to get really clean of scent.
Every hour seems a bit much. I forget how old your puppy is but I'm thinking you got her, what, at least a month ago? I'd think she'd be past needing to pee every hour. Is it every hour at your house too? Every hour but in the correct place, makes me wonder about a UTI. Or, maybe Mom is more fun than you (not a criticism, Grandmas are well know for spoiling the kids ) and puppy is over stimulated there, possibly over fed too, a common Grandman foible, and just needs to go more often?