she would want to get an O-A visa in her home country. That would get her a 1 year visa and up to 2 years by leaving Thailand and returning. During that time she could do 12 monthly deposits into a Thai bank of at least ฿ 65 K for the next year and get an O visa.
The young one could be alright until age 20. The 30 yo would need creativity. You could not work. It would be difficult long term
With a considerable amount of money it can be done.
The system is designed for 50+ retirees or wealthy.