Sorry to ask this but i seem to be reading that you are doin this and you are doing that...are you a single parent?

But you seem to be on the right track. Scolding and shouting may seem right to you at the moment. but then it doesnt resolve the problem.
A good communication is important and if needed a proper reward system could be put in place.

If she is having problem with her language, then you could get story books for her to read. Those with more pictorials ones. They help to stimulate the kids mind.
You could also try to make 1 day a different language day in your house. So if your daughter wants something, then she needs to learn how to ask and understand in that language also. .

cheerios