Checked twice.
Somebody checked the list twice, and your mother's entry is short: Mom. Nice. Needs more pages. It's the only line on there that reads like a product note.
It's also true. She has more to say than any notebook has room for, and she won't start a new one until the old one is done. So give her the one that doesn't end. When the pages run out, she swaps in new ones and keeps the cover.

