She was a princess. Surely she'd been brought up, as had Catherine, to know that she was destined to go live in another country far from her own with a husband who may or may not be little more than a political match. It was a woman's duty. A royal princess's duty to put her country ahead of her own needs.
"It is not for us to question His will." She meant God's, but really it could be taken to mean Henry's will, as well. "We must just make the best of it and God will reward us for our trials." As he had after Arthur had died and old King Henry had kept her in rags. "Besides...he shall not live very much longer, and that makes him better than marrying a child, does it not?"