it is advised that she travels by land, as she will not be able to fly to Bangkok from Luang Prabang . she could however try to check-in. If she gets checked in, everything is fine! She can still ask at the airport if her airline will check her in with the "small" medical cert. If negative, she knows her route will be over land
thinks that it is possible to cross over a land border into Thailand with the simple medical letter you already have. The "Covid19-free Certificate" is just for air travel, he says and is absolutely sure about that. So your situation demands a different approach: As you will not be able to achive such a certificate in a timely manner, just don't fly out to Bangkok, but get a bus from Luang Prabang to Vientiane (or a longtail boat!) and cross the land border into Thailand at Nong Khai. You will receive a new 30-days visa exempt entry stamp, allowing you a smooth stay in Thailand until your return flight to Germany
you say foreigners don't need a medical or a covid19-free certificate if they want to enter Thailand by a land border? Do you have any reports from people who will have done this after midnight today . .oops sorry . .we have to await such reports. Can I borrow your crystal ball ?
you might go to Vietnam, but you can't come back to Thailand. You might go to Myanmar, but you can't come back to Thailand. You can fly back to the UK, but you can't go back to Thailand. That's a fact for the next 30 days period, as long as you have to bring "insurance and covid-19 free certificate" to be allowed into Thailand. The 72-hour old certificate is sheer impossible to get. So whoever tells you to try Myanmar or Vietnam, hasn't finished thinking what is the next step. You could STAY in Myanmar or Vietnam if their visa allow you a prolonged stay, though. But there still remains the problem that you cannot go back to Thailand in the next 30 days. This rule is going into effect in a few hours from now