Seasonal allergies in 3yr old? since pollen started she has had clear runny nose, congestion and on and off congested cough. normal? what can be done?

Maybe: This could very well be allergies. This is more likely if there is a family history of allergy. Try on of the over the counter antihistamines. They are very safe and effective.

See Pediatrician: At this early age, it is likely to be a longstanding problem, so you should discuss it with her pediatrician. Dose-appropriate zyrtec (cetirizine) can control symptoms and minimize misery from allergic symptoms.