I respectfully think you're missing the point -- I know exactly what she means, and it doesn't belie an attitude of not wanting to save your client money.

She wants compensation for her discomfort. What good does it do her to ask for compensation, but have it granted in a way that doesn't benefit her?

OP, respectfully, calmly ask for bonus bucks or MR points as compensation. They really don't owe you anything but may give you something as a CR gesture. Esp. since they gave you free parking... tell them to charge for the parking and give you a gift card or BB instead. Tell them what you think is fair. They will either say yes or no, and I would suggest if they say no, to take it gracefully.