I'm providing these links for info only as they are not intended as dignosic aides.
You could try one of these overnight in your daughter's room to see if it alleviates her symptoms any: http://www.boots.com/shop/product_details.jsp?productid=1029739 (you may find one cheaper else where, but Boots are on most highstreets, which should allow you to pick one up tomorrow if you get the chance).