I bought a phone in Bangkok at AIS that has 2 sim chips. I was able to keep my USA number with google Voice and have a Thai number all in one phone. I have an Oppo Real Find X Cell Phone.
That's only because it's substantially cheaper for you to live in Thailand. I think for most people if the cost of everything was the same in Thailand as it is in the United States that people would much rather live in the United States. Take away the sex tourism of Thailand and I think a lot of people would stop going there.
I love Thailand and I love living here but if the cost were the same as the United States I will 100% stay in the United States
She is missing a lot depending on where you are going. Who doesn't want to see las Vegas or Disneyland if they have never been? Taking a trip on the Pacific Coast Highway. So much to do in the states. The way you felt your first time in Thailand may have been magical and that is what she would feel going to the US for the first time.