My wife holds a Thai passport and a American green card. We were booked to leave yesterday morning. Upon checking in at the airline counter they notified us she would need a "re-entry" visa to return to America. I did a quick Google on the process and couldn't get a satisfactory time line, so we aborted the trip. I did a search of this forum but only found info. on re-entry permit for coming back into Thailand. Never have we needed one before. What's up?

Good afternoon, traveling to America for two weeks soon. As far as I’m aware, all I should need is proof of vaccination? I have the Thai Vaccine Passport... is this all I will need? No apps or regestrations?