Thank you so much for your replies, Rayquaza17 (correct me if I'm wrong, but are you a Pokemon fan?) and Maneki Neko.
Acana seems reasonably priced at RM20/kg but does it come in hairball control?
My aunt advised me earlier today that regardless of the pet food, we should make some effort to buy hairball control formula because there might be complications otherwise.
She also mentioned that the ProDiet cat food which we are feeding her is og good quality, but I have yet to check the ingredients (when my dad bought it, they repacked it into another bag as a sample pack). Tried to Google their ingredients for myself but couldn't find much information about it. All I know is that it is apparently Malaysian and, call me paranoid, but I'm skeptical about Malaysian-quality pet food.