I got a visa for my girl to com on holiday to Spain and in effect the same visa.
You need proof of monthly support ie you give her money every month. She has to have a job and not in sex industry. She also needs land and family in village to want to come back to Thailand.
The main thing is you need lots of money to be able to support her. Lots of proof together and photos with no Alcohol in photos
My friend was having his money from his pension coming in every month and then he had one month paid to his x wife so he paid that into his bank and was told by Jontiem that he did not qualify as he missed one month. He is from the USA and lived here for 5 years so be careful