You did exactly the right thing. If you become complacent in the care of your daughter, she will become what others make of her. I further commend you on your dietary profiency.
Trying not to generalise, Thai's sometimes seem thrive on thinking they know everything about food and what is good for you. Some will even dump things in your food for you, because it's the way they like it. I personally hate 'pat see uut' with a spoon of sugar and peanuts on it. It taste great with just a dash of vinegar and peppers to me. To each their own.
When you find anothr nanny, try to lay down ground rules before you hire them, sit down and make a list with your ol' lady and translate any that need be, and ensure the new nanny knows before hand how you want her raised....good luck