T.W.
Good for you for breastfeeding...you are doing the best for her and sending immunities to her for this illness. My experience with sick breastfed babies is this: An average formula fed baby will get sick and be VERY sick for 3-4 days. The average breastfed baby will get sick mildly for a few weeks. I assume its just that the immunities are working so the illness is less severe, but it persists instead of running its normal course. Keep a humidifier going and nurse as much as you can. The more breastmilk she gets the faster she can fight it off. Good luck! :)