Mysterious handprint (Halloween Story)

I got my Halloween fright a bit early this year.
I got a scare when I noticed a mysterious handprint on our bathroom mirror.
As you can see, it's a rather large mirror over the vanity, where a person would need to be over 6 feet tall to reach that high.
A hand like that on your mirror is creepy right?

Then it donned on me - either 6 feet tall - or a ghost - or my toddler on her tippy toes standing on the counter. I presume Astrid's babysitter let her stand there while towel drying her off and Astrid felt the need to reach up there.