Seeing how it seemed this was going on a few blocks away. You would go there still as a 3 yr old. The book user wouldnt expect a thing. Thankfully you wouldnt need to go there naked as after the incident at work you bought clothes and supplies in case you did something like this.
You put on a pear of pullup, purple tights and MLP shirt. Put the books in a wagon and went to the location where the chaos was happening. There were people acting weird and asking if anyone know who they were as they had their memories erased. It was chaotic. You knew you had to be careful or he would do the same to you...probably even forget ever being older. But you had books to transform so might give you an edge especially if he thinks you are a normal 3 year old girl.
You look to find the user of the book. Then you spot them. A 14 year old girl. You were expecting that. The other users have been adults not a young girl. She looked like she was having fun. Then you realized where you were. It was the nearby school. The victims were likely the teachers.
You had to make your plan. You go about and...