It sounds like Tourette's. Many people are familiar with Tourette's people that yell out obscenities, but it's very common for minor versions of Tourette's to have eye blinking or other ticks.
According to the Mayo Clinic signs usually start between ages 7-10. Risk Factors include a premature birth or a family history. You could read through their info and see if you see any other symptoms that sound familiar.
My friends husband has Tourette's and just has physical tics. He is completely functional, it doesn't interfere with his life. (Just so you know)
Good luck Mom.