Wonder why they make it hard. You are here. You are genuine . You've got a thai squeeze. You spend bucket loads of money here which helps the thai economy. How do these shady Indian, North African, and Middle Eastern people slip through then harass everyone at their shady trading outlets in the major tourist centres.?centre's.?? Got me stumped.
So if your thai lady of 36 years has a thai passport - that parts easy. You just come in on 60 day permit , extend it by 30 days ( 1900 baht ) that gives you 3 months. If you want to do the same again , do a quick border hop and refresh in Laos or Cambodia. All easy peasy.