You will need to provide evidence that she's coming back to Thailand Ie kid's and a job or a home and money to spend in England, some sort of family life is going to be sure that she is going back home after the holiday
Waiting is the best thing to do at the moment Until the new government is formed and see what happens next with the rules for the xpats if anything is changed
But I would advise you don't give any thing up in your home country until you are 100% sure that your happy to give it up