S.H.
Nasal congestion can be due to:
1) stuck nose mucus
2) inflamed nasal passages. Hence, making it hard to breathe.
Snoring, due to stuck nose.
Discomfort = fitful sleep
Antihistimine: dries out the mucus
Saline spray = loosens the nose mucus. Does not get rid of it.
But inflamed/constricted nasal passage can still be present.
Steroidal based meds.= addresses the inflammation. By dilating the passages and/or the bronchial passages. Thus, making breathing normalized.
It is used for short term.
If she can, I would also use a "Neti Pot" nasal rinse. To clear out her sinuses.
There is also "Little Noses' nasal decongestant for kids. Found at drugstores. I use that on my kids when needed.