Saving? So you won’t have an income when you move here? How old are you? Probably a million US dollars then when that runs out you can sell the buffaloes you bought for the three bar girls you met and bought houses for.
Even if she did get a visa (it’s not impossible) for Mexico. And you tried to go through land border. They would turn her away. My Filipino wife was a permanent resident of Canada. We lived in Winnipeg. I was driving to Windsor Ontario. I wanted to go through Sault Ste. Marie Michigan because it saves 12 hours of driving. U.S. immigration wouldn’t let us drive through. It’s a 6 hour drive. The female immigration officer was stamping her refusal for entry papers like she caught Al Capone. Coming back I went through Detroit tunnel. I had a Customs Officer. I already knew my plate was in their system. I pulled up. Flashed my badge. (I worked for CBSA) First question. “All Canadian?” I no sir my wife is a permanent resident we’re just driving through cuz it’s only 6 hours. He nodded his head, he understood. Then cocked his head to go through. “Thank you very much!” He had common sense.
I looked into Mexico. Make sure she has money in bank. A criminal record check. A return flight and hotel booking. Ties to bring her back to Thailand. She could probably get one.