A vapouriser or failing that take her into the bathroom with you & steam her! Try to raise the head of her cot a little bit, phone books under the legs or a pillow under the mattress. If she is bringing up any stuff when she's coughing it's best not to give her medicine to suppress it as she's far better off getting the rubbish out of her lungs. If she has any green mucus take her off to the Dr as she might have an infection.

Good luck hun, it's not nice when our babies are sick *hugs*