Some things to consider;
The schools with an English system will be an easier transition coming from Oz than to a US school. Not much easier but a little. Also some (most) schools here are a business first and a school second, so check on their structure. I would recommend a school that is "not for profit", some of these have been mentioned, Dubai College (DC), Dubai English Speaking College (DESC) not sure about English College?? (EC) . I assume you are joining EK??? then where you live will be a factor as you do not want to spend a lot of time on the road. Most colleges have a bus system, check for this. If you end up at Silicon Oasis then DESC is very close and although new, its junior school has been here for 25yrs or more and is very good. If your daughter is academic then I would suggest DC is worth a close look, they do require an entrance test however.
Best of luck (you might need it...)