A.M.
i won't say it's a phase - it's a phase to try it out. how parents deal with it determines if it is a "phase", which comes and goes, or if it becomes routine. *shudder*....
my son gets nothing - literally, nothing - he wants by whining. never has.
if it's whinese, i can't understand it. he doesn't get attention, he doesn't get whatever he's asking for. the most he will get is a reminder, "you need to ask me like a big boy."
it's a habit that has been allowed. when you stop responding to it she will stop doing it. hang in there mama.
use simple communication to explain, "mommy can't hear you". teach her how to lower her voice and ask nicely. show her by example, multiple times if necessary. start it now and she will get it quickly.