I have a seven month old who also has had a perpetual "cold". I have found that the cough is more from post-nasal drip than anything (his lungs are always clear when he goes to the doctor). Have you tried saline drops in her nose - they seem to help my son breathe better and gag/cough less. Also, now that he is rolling over by himself, he sleeps better on his stomach or his side - less drip into his throat. There is also a Vicks rub for babies - it's a lotion not the greasy stuff - it seems to help my older son who has a heavy cough whenever he gets a cold. Good luck - I hope Amber is feeling better soon and you are able to get some sleep!