It has nothing to do with the current president. This has been standard for decades. Do your research, try again. It sounds like you were really focused on the financial side, when really they're more concerned with 1) the permanence of the relationship, and 2) a plan to get in, do something specific, and GTFO. Then, if she acts nervous or confused in any way (which is normal), she'll get denied anyway. Par for the course!
This is what I keep wondering. As a US lawyer, I'm aware of many solutions to the problem, but I haven't been seeing ads or comments from Thai lawyers or organizations discussing solutions. Any recommendations?