says (With border run and extension), Special Tourist visa 90 days and 2 x 90 days extension (until now until september) if you qualify also Multiple entry Non imm. O, (4x border run for 90 days each). Possibilities enough I would say even without (covid) unable to travel home extensions.😉
Both are possible indeed. When you make a non imm O retirement in Thailand you have to go to immigration a couple of times and already transfer 800k฿ in your Thai bank account as international transfer. Then after 60 days you can ask for a year extension based on retirement. With the non imm O retirement in y'r country, you get 90 days already and after 60 days you can ask the year extension with or 2 months before the 800k฿ in your bank account OR an income statement (affidavit). Much less hassle.
? I did this procedure from 2010 onwards (I now already live in Thailand for almost 5 year). Not THAT much changed. Only she has to go to VFS Global in the Trendy building. Write an invitation letter and that you take care she goes back. And you need the 'garantie verklaring' with income and you let her stay with you, stamped by y'r local municipal office. Also copy of her last visa may be helpful.
if the Thai Embassy/ Consulate in your country still sells the 6 months multi entry Tourist visa. It allows you to stay 60 days and then a border hop to get another 60 days. (for now you still need a Thailand pass). This can be done untill the end date of this visa. So if you do a borderhop right before the end date, you can almost stay 9 months (last entry 1 extension of 30 days).