What course is your sister studying? Different course use different software and may need more or less powerful laptop.
Asus Malaysia and "good customer service" don't go well in the same sentence

If you really want Asus 15":
N56VZ-S3151H, i5-3210M + Nvidia GT650M@RM2799[2.7kg][B&O], 4GB, 750GB, W8; color: black
A55VJ-SX093H, i5-3210M + Nvidia GT635M@RM2499[2.52kg], 4GB, 750GB, W8; color: black
A55VD-SX520/521/522H, i5-3210M + Nvidia GT610M@RM2149[2.52kg], 2GB, 500GB, W8; colors: white/blue/red
A55VD-SX471/472/473, i3-3110M + Nvidia GT610M@RM1599[2.52kg], 2GB, 500GB, W8; colors: black/red/white
For girl and if she need to bring it around, may be 14" is more suitable. Have a look at these Dell:
Vostro 5460, i3-3120M + HD 4000@RM1549[1.54kg], 4GB, 500GB(5400rpm), Ubuntu 12.04, 3 cell; W8SL@RM1,749
Vostro 5460, i3-3120M + Nvidia GT630M@RM1949[1.54kg], 4GB, 500GB(5400rpm), W8SL, 3 cell
Vostro 5460, i5-3230M +Nvidia GT630M@RM1899[1.54kg], 4GB, 500GB(5400rpm), Ubuntu 12.04, 3 cell; W8SL@RM2099
Vostro 5460, i5-3337U + Nvidia GT630M + (32GB mSATA SSD + 500GB(5400rpm))@RM2199[1.54kg], 4GB, W8SL, 3 cell
Prices are RSP, negotiable.
She's doing more on Banking and Finance. The laptop would be more on assignment purposes.