Photos of you and your wife outside the house or condo and inside your home,
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0thb in the thai bank for 3 months copy of your marriage certificate, and the rent agreement, letter from your landlord, this is as best as I can remember, this may help you with your problem
She will need to provide evidence of her work and family so that they will be happy for her to return back to Thailand, also she has money in her bank account for the holiday, and that she has a home to return to and a job, you have to provide proof that you have money to support her and pay for her return to Thailand if necessary