How did she get here?

How did Ellie get into our bed? This is how the evening began... The TV is the master bedroom was on as we were giving the kids a bath, we had it on Nick Jr. so the kids could watch while they were waiting. We never turned the TV back off. Fast forward a few hours to bedtime. Bryan put Ellie to sleep. They were in her room, read stories and then Bryan left. Bryan and I were working in the office at the other end of the hall. We never heard anything. Ellie had cried out a few times early and Bryan went to her. She was always in her room. When Bryan and I decided it was time for us to go to bed, this is what we found...

Ellie was all tucked in and watching cartoons. We never heard her get out of bed, walk to our room or anything. She was little miss stealth.