You're asking this question to strangers for advice, meaning you're not trusting your woman yet... There will be a question afterwards for you! Are you ready and willing to marry her? Or is your marriage for settling in Thailand? If you answered the second question with a Yes, then my friend you have to pay something for settling which is giving a property for her. If you answered the first question with a Yes too, she's your wife and go for it. If all are blurry answers yet, find another solution that won't hurt your pocket.