all you need doing it in person at Chaeng Wattana immigration for the 90 day report is the form, your passport, and if they ask, a copy of your TM30, but as long as it is on file in the computer, and the addresses match, they won't ask. You don't need anything else, no copies of your passport.
If she rents the condo then her landlord does the TM30 on you. If she owns the condo then she registers you on the TM30 website. You do nothing. It is not your responsibility, no matter what you read.
actually I am very correct. You might be technically a tax resident after 180 days in Thailand, but that does not mean you automatically must file. Far from it.
If you don't actually do any work in Thailand then don't worry about it. Thailand trusts that you paid your income tax on any money you bring in, until you prove them wrong. If you actually make money working in Thailand, not remote work, then you file Thai income tax.
passports are incidental. All someone's full history in Thailand is by facial recognition, and fingerprint/thumb print, at immigration. Overstay history is flagged in what comes up on their screens.