Well, she could influence a dream if she so wanted, like in the case of Scoots, but can leave it be if things are going normally. I don't think she would want to be behind the controls of every dream there is. I wouldn't. That would take up a lot of time, and have to know the desires and fears and personality of every single subject. Why not let them do it autonomously and intervene when needed?
Again, there are situations where she would influence dreams. Whenever she shows up in fics in dreams, she has at least some control of them. It's pretty much canon by now. She could find out where a specific person is, give them instructions from afar, teach them a lesson they are having a hard time learning by themselves, etc.
heck, she could punish criminals with nightmares (hue)