N.W.
My 7-year old wouldn't sleep in her bed. So we had fun "dressing up" her bed. We strung white Xmas lights over the canopy. We cleaned underneath so she could see there wasn't anything under there. I started running a fan so there was a little white noise and then added some "sleepy music."
She loves sleeping with the Christmas lights on.
Another friend of mine used her baby monitor on her 5-year old. The 5-year old knew she could call for her at any time and she could hear. The idea was fun, and after a few nights the novelty wore off and she didn't need it anymore.
It's possible if you're firm about her sleeping in her own bed it will go away just as suddenly as it arrived. Kids are strange sometimes!