Morgana waits and watches the Doctor as he climbs. Since he can't see her, the facade drops, and she's concerned. She's also quite impressed he's managing to climb at all, although, to be honest, despite his claimed aversion to weapons (she's seen him use a sword so she feels it's a bit hypocritical) she knows he's not weak. Not that she plans on telling him.

She also has no intention of starting her own climb until he has a firm grip on the floor of the shed.

"It may be holding you adequately, but I would not wish to test the both of us," she shouts up, her voice echoing in the cave. While he's climbing, she takes a moment or two to wring a little more water out of her dress. What she does not need making such a climb is all the extra weight of a drenched dress.