Toddler sprained her neck😔😔

RJ

Hi ladies. My daughter is 20 months old. On Wednesday night in sleep, she sprained her neck on left side. AS soon as she woke up she couldn't see on her left side, but she doesn't had pain. I called her pediatrician , she advised to give tylenol and use ice pack. I gave for a day n she doesn't have any pain. But still she couldn't see. Is this something to worry. Also should i go to doctor? Any suggestions please. Thanks!