My 15 month old rolls her eyes and my SIL told me it's "probably involuntary"?

Involuntary? lol... unless she was having seizures, I don't see how it could be involuntary.... If it was an involuntary thing then I would be concerned. If she is rolling her eyes at times when it's actually appropriate to roll her eyes, she's doing it on purpose. If her eyes start rolling at random times, take her to the doctor... I think she is doing it on purpose.