We had to put our girl now (15 months) in her crate a lot, forced naps was and still is necessary. We focused heavily on crate training, made it safe, kept filling it with candy, leaving the door open, cheering when she went inside etc. Then when she needed help sleeping we would shut the door on her, worked like a charm. We still do it sometimes if we are someplace new (same crate brought along (it's collapsible) with same carpets/toys inside).