iisha - what has happened is local parents want something better education-wise for their children. So a lot of private and "international" schools have opened up to meet the demand. Most of them are just a variation on a local Government run school and follow that curriculum to get the school leavers exams. Most that call themselves "International" add a few other subjects from another curriculum (often UK) and the education is in English.
To get any Government support to attend University the pupils need to sit the standard Malaysian exams and score well. Without that no burseries etc. They need to score highly with up to 7 A's. Otherwise is probably going to be family funded further education. The school you mention and which Ardan has nicely summarised looks OK, is run by Chinese staff and seems to cater mainly for that community as well. Bearing in mind the ratio of Malay/Chinese/Indian/Others the kids tend to sometimes end up in more segregated schools for a number of reasons, including languages spoken. But fee-paying schools do get better local exam results (Chinese-run ones are particularly successful)
Family's that can afford to educate their kids come in many different shapes and sizes. Some are super rich and they will choose the elite schools with the high fees (ISKL, Alice Smith - royalty and vvvips etc. use this one, BIS). The schools in Mont Kiara are popular and huge in size, simply because it is a midde-class area with quite a few expats and that is a ready audience to attend fee-paying education. So location is also a factor.
It all depends what you want for your daughter. A truly international education that leads to IB or O/A levels based on UK standards? A more laid back education system at the Australian school? Continuity in a particular curriculm that can be followed still when you leave Malaysia? Education that has a bit of everything, but potentially not enough depth? Your financial situation will dictate and also the age of your daughter.
As she will be moving on to senior level quite soon, its very important to look ahead. Is she a highflier and can really benefit of ultra-expensive education? Will she struggle if she is alongside lots of highfliers and get to hate school? Is school more of a social experience at her age, so broad-based subjects and integration with others is important? How will you control continuity once you leave Malaysia - e.g. if she starts on the IB programme could she continue elsewhere?
India is quite well known for having a pretty good education system and has (used to have?) the highest literacy rate in the world. So if your family return to India, where would you see your daughter being educated? That should guide what you choose in Malaysia - as it is just a bridge to the future.
When you know what are your and her limitations, then you will be well equipped to choose a school in Malaysia. Our kids tend to be 10%+ more intelligent than the sum of their parent's educational level. That should also guide your choice. Is she going to be a doctor/scientist and therefore would benefit from a high class English language education, or is she likely to be a fashion designer, work in IT or run her own business (remembering familes often follow in eachother's footsteps). It just different pathways to get over the hurdles and through the hoops. Make school fun is my motto as kids succeed when they are relaxed and enjoy themselves.