What is a proper visa? I enter and leave several times a year for a stay of about one week. I am not going to pay for a DTV. I live near the Cambodia border. An expensive visa is overkill.
Is it a drop-down list or fill in the blank? Most Thai forms seem to use a list which helps a lot. In any event, it will be difficult for the average tourist.
Even if she is married with a green card, immigration will notice multiple travels outside of the US and they will cancll the green card. The only long term solution is citizenship. That is my direct experience.