Does your wife have assets in her name, such as a car, house, land, etc.? She will want to show that she has ties to Thailand and has a good reason to return. They may also want to see your passport. I've heard that after you've been married for 2 years it gets a little easier, but they still reject people for seemingly no reason. My wife and I were married over a year, with a new baby, and they rejected her visa application. They looked at none of the stacks of copies and documents we spent months preparing. We're going to try again now that we've been married much longer, have more children, and assets in her name. I feel like it's
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if we get rejected again.