First off, please make sure to give her ALL the antibiotics until they're gone. People who stop giving their child antibiotics as soon as they start feeling better are the reason why we have superbugs that are immune to antibiotics. Okay, off the soapbox.
That said, my daughter had the same thing as a young baby, probably around 18 months. Seeing your child wheezing and having difficulty breathing is horrible. My daughter had stridor (sp??), an aggravated type of croup. After that bout, doctor put her on a nebulizer, which helped greatly. We also found that turning on the shower as hot as it will go and sitting with her in the steamed room for as long as you can stand it also helped more than the cold air treatment. Now, at 10, she has asthma meds that we give her immediately at the onset of any head cold. We know that all her head colds eventually get to her chest. Starting the asthma meds (albuterol) keeps things at bay.
Please also know that if your child gets croup (that barking type of cough), she will outgrow it. It seems like forever when your child is young, but it will definitely get better and more manageable as she gets a little older.
Hang in there, Cristy! I'm pulling for you, and hope that your daughter feels better very soon.
Take care
L.