my gal is 5months old still having flu. what kind of oil can i use? can it be apply on her?

I wouldn't apply any essential oils directly on baby unless the oils are properly diluted. Some essential oils that are generally considered safe for babies 6 months and above and are great fighting cold and congestion are cedarwood, sandalwood, cinnamon leaf, thyme, lemon and ginger. Using a diffuser would be a better idea than applying the oils directly, I feel.