This entire thread is caused by the main issue that was recently litigated by a Tall Club out in California which IS: Tall people have a feature (being tall) which is NOT changeable physically, similar to african-americans (who can't change the color of their skin) or other features. We are tall--we can't help it. Why should we be penalized by the airlines for that? Or incur the wrath of a fellow passenger?
She is tall, she can afford a coach ticket. She shouldn't be raped by first-class fares and punished for this feature.
What do you suggest she do? Have her knees surgically removed so she can be 3 inches shorter?