。
She filled her bag with apples.
Literal
She [topic-は] her own bag [object-を] apples [with-で] filled.
満たす ('to fill, satisfy') takes the container as direct object (を) and the filling as means/material (で) — the same case-marking pattern as English 'fill X with Y.' りんご ('apple') often appears in katakana (リンゴ) but is also commonly written in hiragana for warmth or readability. バッグ ('bag') is a loanword from English.