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Try giving her Hyland's Naturals Baby Mucus + Cold Relief. It is an all natural homeopathic decongestant and cough relief.
They have a daytime and nighttime version; I get the combo pack. This stuff is AMAZING! (Make sure you get the liquid version)
I am not the only one who swears by this stuff, Check out the reviews on amazon.
Hyland's Baby Infant Cough... https://www.amazon.com/dp/B01DZ0CN6A?ref=ppx_pop_mob_ap_share