Good evening, girls! My daughter has had a runny nose for two weeks no…

Good evening, girls! My daughter has had a runny nose for two weeks now, with clear mucus dripping out. The doctor only prescribed plenty of fluids and saline nasal washes. We're ventilating the room regularly, going for short walks because it's already cold. Has anyone else experienced a runny nose this long? I've never dealt with something like this before, usually it lasts for 5-7 days, with no other symptoms.