Liquid coming out of nostril of baby.

Hello doctor, My baby is 1 yr old. She had fallen from her rocker last month on 8th June. I noticed a few hours after she fell her right nostril had become moist. Also, there was a slight change in her behaviour so the doctor recommended an mri scan which was mainly normal except for a mildly prominent fourth ventricle. The doctor said it will subside on its own. I noticed now that within this month of her falling every once in 2 weeks or 6 days till now a clear liquid type substance which leaks out for 2 or 3 mins from her right nostril and stops after that. Once the leak came from her left nostril. This happens for barely a few mins and then the next episode happens after 6 days or sometimes 2 weeks. She sneezes a few times in a day and coughs maybe twice or thrice in a day. Otherwise she is comfortable and cheerful. I have read online about csf leaking from her nose. Could this be a case of a csf leak? i am very worried. i am confused because this leak happens after a big gap.