As the check-in will be open at that time you shoud be fine to do it. They are join QF/BA desks managing all the BA9/10 and QF1/2 operations. I flew QF2 in June last year and checked in about 5 hours before so it should be OK.
In relation to assistance for your mum you should ask the agent or QF to add a 'Meet and Assist' (the SSR code is MAAS) and if required a wheelchair - there are 2 types WCHR (can climb stairs) and WCHS (cannot climb stairs).
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