G.:
I thought you were moving to Shanghai...?
Since money is tight - take your daughter out of day care - you are a SAHM so teach her yourself. Take on excursions and teach her the culture of the country you are in...
If you don't like that your BIL got his child into the same school for free - tell them that you will pull her from the program if they don't reduce your rates...but I tell you - here's where we run into a problem...NOTHING is FREE - NOTHING...so somewhere some how someone is paying for those who aren't paying....and it sounds like you are doing just that...so instead of subsidizing it for others - take care of her yourself.
Don't look at what others have and be jealous...it's a waste of your time and effort. Focus on what you do have and work with what you have...
Don't stress over your MIL and BIL - not having you and your daughter actively in their lives is THEIR loss - not yours. So just press on...pull your daughter out of school - she's 3, you are a SAHM. Teach her yourself...she has an opportunity that many kids here in the U.S. will NEVER have - so take advantage of it to the fullest.
Let the anger go for your MIL and BIL - you are a SAHM...why would you need someone to babysit your daughter full time anyway? He and his wife both work. You don't work outside the home.
GOOD LUCK!