She must have solid reasons to return to Thailand. Eg. Property , investments, a business, family.. a job alone won't cut it because she could earn more with a job in uk/us/aus etc. Also you've got to show you've got a real and long term relationship.
...I went through all of this chap...glad it's behind me now.
if I transfer from a pension fund saving account in UK to a UK savings account to a thai bank account for retirement visa ext purposes,.. is that classed as income? I havent worked for years , no income just living off savings.