When you arrive at the car with her, open the door, but don’t boost her in. She might stumble, rip a ruffle on her new dress, — and would your stock go down then!
When you arrive at your destination, get out! Run around and open the door on her side. If you’re riding in a rumble seat, the “don’t boost” rule goes here too. Give her your hand and shower the best places to step. Steady her with your hand or let her put a hand on your shoulder if she wishes.
Don’t try to lift her, throw her in, or do any other “cute” little thing of that sort. Girls think about damage to shoes and clothes, and generally each has her own way of getting in and out of a rumble. You will get out first and get out on the ground. Then give her your hand as a support while she steps out.