Get her to drop you off at the kerb at Departures, the Car Hire 'Lot' is directly across from the Terminal, the main one, but you might need to go upstairs and cross using the covered walkway.
Thanks. Didn't realize it's that close. On the other hand, it appears there is a shuttle bus that can let you off at the car rental facility main floor, which I've read is there the rental counters are located, with the cars for pickup on higher floors. And so I'm thinking that if there's a place for the shuttle bus to let you off, I should be able to use that, too, to be dropped off by car.