My 2 year old granddaughter suddenly is terrified to walk. She starts shaking and screaming like…

My 2 year old granddaughter suddenly is terrified to walk. She starts shaking and screaming like shes going to fall. As far as we know she has not fallen down or anything. She has not walked in 2 days. Should we take her to her doctor immediately or see if this passes? I have never dealt with anything like this with my kids or anything of my other family members.