My little escape artist

My mom and I were sitting in the computer room when she realized Natalie was missing. Usually it's no big deal because she walks down the hallway and goes into Samma's room and plays with her toys. So of course, we walk down the hall looking for her and she's amongst the missing. I realize that the gate to the stairs was opened and my heart sank. All I could think of was LiLi being at the bottom of the stairs. So of course, I look down. She's not there! Wheeeeew. But where oh where is she? If I didn't have her replay it, I would swear one of my kids put her outside! We found her out in the driveway! She crawled down the stairs, and someone left my front door partially open. She opened it and walked right out to freedom. I didn't believe any of the kids when they said they didn't help her, so I put her at the top of the stairs (while I watched closely- of course I had grandma's camera..........). Here it is: the sequence of events.....not even one and she's trying to run away.