I would have just told him that PJ used magic to bring life to the
Lego minifigures to play.
I feel so bad because I did forget last night. We were all sick yesterday and during the night. DD woke me at 3am to go to the bathroom and I remembered then but I thought that I couldnt do anything because she was still awake but I always wake many times during the night so I figured I would do it just before she gets up. Well, next thing I knew, she was waking me at 7am (forgot to set my 6am alarm to get up for work) asking why Alisa was still on the couch where we left her last night.
So I had a half hour to get ready for work and write a little sticky note from Alisa saying that she was sick and went home to the North Pole for the day. Apparently, my head was still in a fog because I didnt think it through. DD asked how Alisa was at the North Pole when her body was still here. I told her that the doll is just her Avatar.

She was satisfied with that since she knows what an Avatar is.
Then she felt bad because she thinks she made Alisa sick because she hugged Alisa really close to her face yesterday.
She is just too darn smart and can out think her mommy.