Have you cleaned out her enclosure recently? Mine has striked at me before after I cleaned it or added new stuff, etc. because she loves to explore her new home. Mine has also taken a strike because she was about to shed. Maybe she is just feeling mello today and wants to be left alone. I wouldn't be too worried about it, you seem like a pretty practical keeper.
Added: I've had dreams about my ball python before too. At least 3. So I wouldn't be worried about that part. You are still learning the ropes.
Joey