Stephen probably should have stepped in and helped her. And he would, if he absolutely needed to. Unlike the previous sorcerer supreme, he wasn't going to let her fail to teach her a lesson. The Ancient One had a very.. sink or swim teaching method that Stephen did not entirely agree with. He didn't want to be coddled, per se, and surely neither did Daphne. At the same time, he wasn't going to strand her out on Mount Everest and let her figure out on her own how to get back..
Or let her freeze or torch herself, for that matter.
"For what it's worth, I think you're doing a wonderful job." He paused, placing the books he'd picked out for her on his desk. "These are for you, to help you study. Just remember to take it easy and not to rush if you practice outside the sanctum. I.. definitely set my room on fire more than once back at Kamar-Taj. It happens. No big deal. Just.. try not to. And you'll get the hang of it. Trust me, you will. And once you do, we'll move on to the more difficult stuff. Like charms and transfiguration."