。
She picked the car door open with a hairpin.
Literal
She [topic-は] hairpin [with-で] car's door [object-を] opened.
で marks the instrument used for the action. The image of jimmying open a car door with a hairpin is a stock cinematic move — its presence in a Japanese sentence likely signals the influence of crime drama or action thrillers, where this trope has migrated globally. ヘアピン ('hairpin') is a katakana loanword — the long ー captures the English /eɪ/ vowel.