Put baby Vicks on her back, chest and under her nose. Take her in the bathroom turn a hot shower on and sit in the steam and prop her up when she sleeps it helps also I forgot what the medicine is called but it has a bumble bee on it and it's infant or baby I think I've been giving it to my son since he was a baby I just cut the dose down and it helps a lot too I mix it in his milk
If it's really bad take her into the doctor. There are some over the counter cold medications that are safe for infants, but you would need your doctor's recommendation on what to take and also the dosage. Hope she feels better