My 8 months old baby girl has a high fever, cough, and cold, diagnosed with bronchiolitis?

My 8 months old baby girl had a high fever, cough, and cold. We went to the ER and she was diagnosed with bronchiolitis. She was prescribed a nebulizer and then put on Asthalin. At the hospital she was put back on nebulizer after 2 days because her peripheral capillary oxygen saturation went to 87. How dangerous is this?

Female
Age: 8 months
Medications: Asthalin