Thanks Everyone. To answer some questions
I've flown before and she was great, got nothing against flying, DH thinks drive will be a fun road trip ??!! Nope!
Mum has cot and high chair and nappies etc. So we wouldn't actually need that much stuff, just nice to be able to have car.
I have looked at an overnight stop in tours.
Mum lives 2 hrs South a bit and West of Toulouse.
I didn't want to fly as mum picks up up from airport and my sister is over for a weekend just before we go so mum is doing 8 hours driving for her then we'd be over and I don't want to make her do that but car hire adds such a cost to trip.
So, I think our best options are to Drive and stop overnight, or fly and hire a car, or fly and arrive as mum drops sister at airport
I'm too worried about all the stopping and upsetting LO so think just fly!
Thanks for all advice and helping me come to a decision x