You pay your money and take your chance but if you decide to roll the dice, at least have the 3 proofs in hand and also be prepared to be turned around and sent back on the next flight.
If she's registered and doing it online then just do it again whenever you come back from being away, especially if you booked into a hotel in Thailand because they will register a tm30 in your name.
I mean really, is it worth the discussion if it only takes less than 5mins of your time to do it online. 🤷♂️
... that wouldn't have been from the Thai consulate in Hull by any chance? I had a few from there as it was well known they were quite liberal in handing those visas out.
... 2 months seasoning before application but you can also extend your 60 day visa exempt entry by 30 days at the IO for 1900 baht to give you more time if required.