。
My daughter burned her finger on a match.
Literal
Daughter [subject-が] match [with-で] finger [object-を] burned [completion-しまいました].
やけどする ('to burn oneself') takes the burned body part with を. で marks the instrument — 'with a match.' ~てしまいました adds completion/regret — 'she went and burned her finger.' Concerned parental tone.