Buffy was most definitely not in the mood to be pulled around like a disobedient little kid, but Spike was stubborn, possibly moreso than even she was herself, and so she went along with it. Not like it was a bad idea, though. She was bleeding, and that was never a good thing when vampires were concerned who might want to take advantage of that. She was a Slayer, yes, but a currently weakened one.
"Lucky," she echoed in a bit of disbelief. "Maybe in some ways. Maybe because of you. That's about it."