Which country do you want to visit. America is too dangerous and Europe is okay, except for the UK. Avoid that island as your life depends on it. Just bring her to Singapore or Japan if you want a western feel for her
If that is just for the visa and no classes then it is peng maak maak. You tell Fairfax that their visa is expensive since the DTV. Some places offer a 5 year DTV for a little bit over their price. Tell them they know their visa prices is no longer with the times and stop being so stubborn. But knowing how Thai companies work, they would rather go out of business then to lower their prices.