It is probably making her stuffy airways feel a little more comfy, it is probably working as an expectorant to help her cough and clear her airways. Probably a combination though of everything. Though Vicks Chest Rub is a useful store cupboard item in your medical box, great for allergies when used on itchy skin as well.
Hello
Personally I find Vicks a tad too strong and I end up coughing even more. I use Karvol oil from the chemist on a tissue. If your daughter would llike something a bit gentler and nicer smelling in my opinion, give it a try.
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