Melaleuca oil is safe and is great for this, and also has antisceptic and antifungal properties. Vicks is no longer recommended for children under two years of age. I usually put a drop or two in a pot of boiling water and waft some steam toward her a few times a day. It not only helps her clear up, but it helps tremendously when there's an infection. My sinus infection went away within a day the last time I did this. You can also just let her breathe in a little of the oil or put a drop or two into a vaporizer that accepts essential oils.