Kid door bell

Anyone know of anything that will inform me when my daughter wakes up? Like something on her door ? Her room is on the other side of the wrap around staircase and you cant really hear on the baby monitor when she wakes up because shes so quiet. Shes been occasionally going to other places in the house while I'm sleeping and I have no way of knowing. I found her in her brothers room this morning and she pooped in her pull up. Shes 3 and been pooping on the toilet since she was 1 so she was just being careless she never does that but if I had known she was awake sooner I couldve taken care of it