Hmm, depends on the reason she is doing Grab. If it is just to cover some costs and to be able to use the car, then sure! If it is to earn some side income, then I strongly suggest you think of another way. I have done Grab before, and just to cover the costs, you have to really work at all the peak hours to ensure that you get the incentives, and then to earn a little bit of cash. Even as a student I have driven up to 10 hours a day for a short window of time, and it can really be torture, and it wasn't as if the amount I earned was fantastic either. In addition to petrol, parking, servicing costs (or rental) etc, you still ahve to think about the cost of getting a PDVL. Getting a PDVL requires you to attend a full day course, as well as take a test on a separate day (fees can be claimed by SkillsFuture/Grab). The test is not a breeze either, and there are many who failed more than once. If you are really just doing this because you need the car anyway, and this is just to cover some costs, and to occupy yourself a little bit, then consider driving hitch, which does not require a PDVL (unless you are driving a rental) and you can pick and choose your timing and "clients" as well.