・The watch was (all) the more precious to her because it was her mother's. その時計は母のものであるだけに彼女にはいっそう大事な

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・The watch was (all) the more precious to her because it was her mother's. その時計は母のものであるだけに彼女にはいっそう大事な🔗⭐🔉

・The watch was (all) the more precious to her because it was her mother's. その時計は母のものであるだけに彼女にはいっそう大事なものだった.

研究社新英和大辞典ページ 228238 での【all】単語。