It's easy. Do the application online through the embassy, answer every question, attach relevant documents, then she attends VFS (currently in Soi 13, but I think they're moving soon) to do biometrics. Pay the dosh and you're laughing
The hack is to first go on OA visa which doesn't require 800k in Thai bank. As soon as you hit Thailand, start the 65k/month regime. Bounce at 12 months to get the second "free" year. At the end of that year, bounce again, coming in on free stamp. Apply for 90-day non-O using the almost two years of 65k transfers to meet criteria. 45 days out from expiry, go the 12-month extension, again using the 65k transfers. Set for life. Two important things to remember, one is that all transfers MUST come from overseas, and you CANNOT miss a single month of transfers.