You can take the tube part from a paperl towel roll and stuff it with fabric softener sheets and it will make most of the smoke go away if you exhale into it. But either way if you smoke anything in a room it is going to leave a smell.. But if she is asleep and you do it near a window and pad the bottom of the door you should be able to do it as long as you are careful.

I used to do this but I never do anymore just because I felt its sort of a desperate thing to do..