My sleeping angel

For nearly a week now Adelaide will not nap in her room. I will do our normal routine, but she will not go to sleep. After an hour of trying to get her to sleep or after a second hour of attempting to get her to nap, I have been laying down with her in our bed. Today it was the last check of the hour and I found her sleeping in her bedroom, on her toy chest. I was so afraid she would fall off, but I didn't want to wake her either so I just let her stay there. She slept on there for an hour and a half.