。
She picked the meat off the plate.
Literal
She [topic-は] plate [from-から] meat [object-を] took.
から ('from') marks the source/origin of the taking — the plate as the place the meat was on. Distinct from に ('to,' destination) and で ('at,' location of action). 取る ('take, pick up, grab') is one of the most flexible Japanese verbs, with countless idiomatic uses (年を取る 'age,' 連絡を取る 'make contact,' 写真を取る 'take a photo'). Note that 取る is often confused with similar-sounding 撮る ('take a photo') — same reading とる, different kanji.