The woman's $64 planner is clearly a generic drop shipped model that she only customizes the cover of. The unit price for bulk blanks is probably $3, but since she's a drop shipper, she probably doesn't buy blanks, or in bulk, which would put her unit price for a small custom notebook order from China at $25-$50.
This is 100% a logistics issue of her trying to minimize risk instead of trying to maximize profits. If she instead purchased blanks in bulk from China for $3 and then outsourced cover printing to a US company for say another $5, and then replaced the blank covers with the custom covers, she would have a $8 unit price, and either have higher profit margins, or could lower costs to chase higher volume.
Let's say she now needed to buy her blanks in America due to high tariffs, and it costs her $5 instead of $3, now she has a $10 unit price. But instead, she's a drop shipper who buys the whole unit for $25-$50 from China, and the tariffs make it now cost $60-120 because she refuses to reduce costs by assembling it herself and sourcing materials elsewhere.
No sympathy for dropshippers,