Avarie is Sitting up

Avarie last night decided she wanted to try to sit up. I had her on the floor laying down and rolling around while she was playing. I stepped outside to ask Derrick a quick question and I turned around to go back into the house and she was sitting up by herself. Then last night she woke up at 10:30 pm for some reason and I walked into her room to calm her down and her little head poped up and looked at me. She had sat herself up again in her crib (luckily after the first sitting up incident I dropped her crib). It made me jump. I have not been used to her sitting looking at me when I go into the room.