Asking for my daughter, who is 19 and currently living in Chiang Mai on a tourist visa.

She's just signed a12month apartment lease and is staying for a number of reasons, medical treatment, she's volunteering 3 days a week and she's planning to study TEFOl and Thai language.

Question; What would be the best visa for her to apply for and can she do this without leaving the country? She is self funded although has no recent activity in her uk bank account, she's been living off prepaid travel cards so far. She's getting a regular monthly income of 28k baht and we are trying to sort out the best bank account for this.. maybe WISE, Starling, Monzo?