First of all, where is your leader Xiao Ruien? With her Canadian team would be much stronger and more competitive.
Secondly, be honest: did your girls really fight against USA knowing that the only result for them to be at the Olympics is to lose to USA? Absolutely not, they lost by a biggest margin in the R16 amongst all of the teams.
Ukraine was in exactly the same situation, because we need to lose to Poland to qualify them at the Olympics and lower the chances of USA. And guess what? We ain't playing dirty and won, moving onto semifinals with idea that only victory at this WC stage can be for us suitable (not knowing the result of Italy vs USA).
So this is thee difference and in case of both Estonia and Ukraine we would qualify by our own effort and not by the help of other, especially without losing to them on purpose.