Wet cough!

So, my daughter (20 months old now) has had this wet, mucusy cough for a few weeks now. I've started giving her echinacea tea with honey once a day (I read that too much echinacea can cause reproductive issues in little ones, so that's all I'm willing to give her at this point). I also got some ginger tea, but after having it myself last night I think it would be too spicy for her. Do any of you have any good natural remedies to help her out?