Maybe try getting her one of those bedside noise machines. You know the ones that make crickets & waves & such? I use one & I turn it on right when I get into bed, whether I'm reading or not, so that it relaxes me quite a bit before I'm ready to sleep.
Anyhow, I don't know if it will help at all, but I was just remembering all the times I've had crickets visit my dreams. Of course with your daughters intense imagination, she might morph them into murderous crickets in her sleep.
Or maybe put a nice soothing CD on repeat for her, played real low?
I have a sleep disorder coupled with night terrors, I've tried about everything that would keep me calm IN my sleep, I could suggest a million more things, although honestly, for a child, that Febreeze idea sounds like a total winner to me! I'd have never thought of it!