Where did Sophie go?

Lately Sophie doesn't want me to go lay her down for a nap. She just gives me a kiss in the office and then runs into her room herself. It has made nap time less of a fight. Yesterday she went to take a nap. She was sleeping longer than usual so I peeked in to check on her.

She wasn't in bed...

She wasn't in her castle....

Slightly worried I started to look around the house. She wasn't there. Panicked I ran to her bedroom window thinking that someone had broken in and kidnapped her. ( I know I have seen way too many Law and Order and CSI shows). Everything looked fine. With light now shining in the room I turned around and...

Why didn't I think of looking there?