Put a wedge under the mattress - you should be able to find one at Babies R' Us...
Talk with your pediatrician...can you give her Benadryl to help dry her up? Or what?
You might be too much of one thing too....sorry - but sometimes Vicks, honey (many will say no to this at such a young age especially if it's not pasteurized) and cold air might be too much. Pick one thing and stick with it.
With my youngest, we had to let him sleep in his car seat. That was tough but it kept him elevated...my husband would bring the car seat inside, we would put it on the couch and strap him in...then I would sleep on the couch (we have a huge sectional) next to him....
poor kid!! hope he gets better soon!!