This might sound funny, but it worked for me when this happened to me....TWO THINGS...A bottle of lavender essential oil and a small (4oz) spray bottle of water.
Help her to write her name on the bottle and have her design it all by herself. Pour about 15 drops of essential oil into the spray bottle and shake it up to disperse the oil through the water. This becomes MONSTER SPRAY!! You can be creative about a story where this is what the doctor said will make the monsters go away. And LET HER spray it throughout her room and around her closet and bed, giving the power to "banish the monsters". It will be empowering for her and make her feel like a super hero.
You can also use about 30 drops of the lavender to add to bedding. Wash the scent through sheets and bedding for the whole family. It is a VERY comforting scent and will help the entire family sleep....
Hope this helps...believe it or not I have seen MONSTER SPRAY sold in health food stores...
As an aromatherapist, I have made many an inexpensive bottle for other Monster Banishers...
A. Brant, Licensed Aesthetician/Aromatherapist