I have tried the app a few times, but have never got it to work. I went to my local Immigration office last Thursday and did my 90 day - a 20 minute drive each way, 10 minutes in the office and it’s all done
As Federico has said, being able to spell her name phonetically will do you no good. Unless she has any old documents with her name in Thai, or a Thai friend who could spell her name for you in Thai characters, you are probably out of luck. You might try having her speak to somebody at your local Thai Consulate/Embassy who could write her name for you in Thai.
I have had my yellow book for a few years now and had never heard of the pink ID card at the time. Is it worth asking for one? I got my yellow book when I was on a marriage “visa”, but have lived here on retirement extensions for the past two years.