She actually does understand the language pretty well, ...sometimes just in single words and up to the most 3 word sentences in the other language (but with a more limited vocabulary).
Um, you may want to find out
a) how many children are older AND
b) how many children are speaking 3 word sentences or more.
I would just call every school and find out how many kids in each classroom that she would be in are speaking 3 word sentences or more. I think that you are kidding yourself about the amount of 2nd language she isn't getting. I don't remember my milestones, but at her age in her 2nd language she is probably ahead of other kids in their solo language.
Don't mean to be a wet banket - basically you have to look for the 'least worst' option, and if needed you can change in 6 months.
Is hiring a nanny a possibility?
Sigh,
Grinity