Blinking hard

Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the excessive blinking in your 4 year old girl.
Excessive blinking in children can occur because of a large number of potential problems. Most cases are caused by benign and/or self-limiting conditions. The cause can usually be determined after careful history and clinical examination. The possibilities in your child include anterior segment and/or lid abnormalities , habit tics , uncorrected refractive errors , intermittent exotropia , and psychogenic blepharospasm.
You must check with your ophthalmologist for accurate diagnosis and treatment.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.