Very lovely... I hope you two have a lovely time and she has a healthy recovery. I also went to Chiang Mai in 2019. We may have crossed paths. Enjoy Thailand!
My dad heard a cat meowing when he was close to dying. You should go to the hospital and get checked up. See if there is anything wrong. P.S. But since that province has a lot of ghosts, it could just be the ghost of a dead cat. Either way, get a physical.
Unless the marriage happened in the USA as well... I don't think she has any legal rights... Only to assets they share in Thailand. Theoretically, I think that is what it would be, but you should ask a lawyer.
I just put my PC desktop computer and large studio monitors in bubble wrap in large suitcases. Two suitcases and a Carry-on. It depends on the airline. You may have to pay extra fees but I am glad I did it that way instead of shipping. For musical instruments or DJ controllers you should be able to carry on or they can stow away in special compartments designated for musical equipment. It really depends on the airline.