I’m not sure if it’s allowed on a post like this. But you can try Thai Law online. They have a Facebook page and easy to reach, and they are multilingual. They may be able to help you.
Are you married to her or just girlfriend living together? I believe you can have the house in your name, but you should do a lease with her. This will help protect your investment. A lease can be up to 30 years and renewed for an extension. There is an online legal service in Bangkok that can help you with this. Pm me if you want the link.