Honestly, I'm not really sure. She starts every session by asking, "What do you want to focus on today?" I usually bring up something we've been working on, or if I'm feeling brave, bring up something new that I'd been afraid to tell her.
But sometimes I can't think of anything, so she will choose something we've been working on. And sometimes the homework she gives is like a series over several weeks, so when we work on those, in session we talk about the homework so I guess that's like her leading.