。
Her hair stood on end at the sight of the terrible accident.
Literal
She [topic-は] terrible accident [object-を] seeing-(and), body's-hair [subject-が] stood-on-end.
身の毛がよだつ is a vivid set idiom — literally 'the body's hair stands on end,' an exact equivalent of the English 'hair-raising' or 'made my hair stand on end.' The image is the involuntary piloerection (goosebumps and hair-standing) of extreme fear or revulsion. Cross-cultural agreement on this physical-emotional phenomenon makes it one of the more transparent Japanese idioms for English speakers. The te-form 見て chains the perceiving and the reacting: 'saw, and (in response) hair stood on end.'