You are worrying for nothing, but I understand.
Its in fact wonderful thats she's found a stuffie that she is comfortable with for sleep, and developmentally normal too. I would actually discurage you from moving it continually as your more likely to cause anxiaty issues with her when she wakes and its not right there.
She is well past the age where you have to worry about SIDS or her sufficating on the bear or blankets or anything else in bed. She's able to roll freely and she's more then able to turn her head.
Rest assured she's fine {{HUGS}}