If her family is wealthy, she has money, a business, strong ties to Thailand…they might still deny her a tourist VISA. If she has traveled abroad before it helps.
I’m an American and was in your situation a few years ago. I made 6 trips here before staying. You need income and/or work you can do from anywhere. For me, that involved continued education and changing careers. You can do it if you think and plan carefully.
If you have to go back, use it as an opportunity to get things in order. A good Thai woman will wait for you.
Feel free to message me if you need to chat and good luck.