Where did they go

The other day Karina and I were in the basement in the laundry room and Mia was in the other side playing with her toys. Well apparently she discovered we were not in there with her and went up the 2 flight of stairs looking for us. I asked Karina if she heard the footsteps running up stairs, and she didn't , so I asked her to look out to see if Mia was there playing still...well she wasn't. So Karina went up stairs and discovered she went to the second floor looking for us, because she thought we left her.