It sounds like you are going through a really tough situation. You sound like an incredibly caring person and genuinely caring for your wife. She is very lucky to have you.
It's really complicated isn't it, with covid making everything even harder. I'm sorry you've had so little time with her. That is really hard and also that she doesn't recognise you.
Have you been able to discuss the situation with her medical and nursing staff at all? Do you yourself have any other family or friends you can talk to about what is best to do?
Does your wife really remember much about her life in Thailand? I'm just wondering how much another move - and a huge one at that - might affect the dementia and possibly make it even worse but I don't know. It's something that might be worth discussing with a medical practitioner?
Your financial situation is making everything even tougher for you by the sounds of it. You seem to be doing as much as you possibly can to help your wife. I hope you are able to take some time to care for yourself.
Carers shoulder so much worry and responsibility. So do look after you too!
I honestly would discuss the situation with her treating doctor if she has one there, and with a senior or trusted nurse if there is one you feel able to talk to.
I wish I could be more help. It must be incredibly difficult going through this alone.
Others here may be able to offer more suggestions than me.
Keep checking in here on BB as you definitely need some support making these decisions and having to cope with the whole situation.
I really admire how much you care about your wife. I also agree with your concerns about the quality of care she might receive elsewhere.
Sounds like you have too much on your shoulders at the moment. I'd be looking for some medical advice regarding the possible effects of a move overseas on her mental state and your concerns about the care she might receive over there.
Are her family keeping in touch with you and are you able to talk with them again?
Please feel free to tell us anything more and I hope others will come by to help here. All the best.