"I don't know you!"

Today I started tutoring one of my students at her house. Valeria's mother does in-home daycare, so I knew to expect some other children around. Valeria greeted me at the door and then we went up the stairs from the foyer. As I reached the top of the staircase a little Asian girl sitting in a high chairs shouts, "Mommy!" She then gets a better look at me and says, "I don't know you!" and quickly proceeds to put her hands over her eyes and say, "I'm scared!"