For context if using the T3 option, if you get dropped off at the main business/first check in row, check in there and proceed to immigration, you will walk about 100m from car to immigration. If you get dropped off at the first class check in area, and have to walk to the main immigration area, it is about 170m from car to immigration. Not a lot of difference really.

If that extra 70m poses a problem for your daughter and mum, then you really should have them dropped off in T1 in the first place ....