A wooded hollow is called a dell. A dell is usually a small,
secluded valley that is usually in a forest.
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A small, secluded, and often wooded valley is known as a dell or in Scotland as a glen. A wide, flat valley through which a river runs is known in Scotland as a strath. (from https://en.wikipedia.org/wiki/Valley)
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secluded - isolated from others
I was secluded when I was excommunicated from the church.
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Secluded means far from society. It can also means obscured from
sight, such as "in the secluded woods."
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You wouldn't use the preposition "to" after "secluded", because secluded is either a transitive verb and requires a direct object, or it is an adjective.
She was secluded from the crowd. would be a sentence that works.