。
She got a good score in English.
Literal
She [topic-は] English [in-で] good score [object-を] took.
点を取る ('to take a score / get points') is the everyday verb for scoring — used for exam scores, points in games, sports goals, and score-keeping generally. The で here marks the area in which the score was earned — 'in English (as the subject area).' This use of で specifies a domain of evaluation rather than an instrument or location: similar to 数学で90点を取る ('score 90 in math'). よい is the literary/written form of いい; both work, but よい reads slightly more bookish.