"Two hundred?" Tip toeing for two hundred yards...hopefully not all backwards, mind.
As if to make a point of that thought, her foot caught on a bit of uneven rock and ice she hadn't remembered being there. She yelped, flailed, stumbled a half-step, and ultimately snatched onto the Doctor's coat a bit more tightly than she absolutely had to...but aside from more creaking (that honestly, maybe she'd just missed before) nothing seemed to come of it.
"...Right." She laughed, and glanced up at him from the floor, grateful the dim light of the cave probably hid most of her embarrassment. "Two hundred yards, no more tripping."