Once he reached the seclusion of the freshly mown lawn, Ron rounded on Harry.
Suddenly Harry became aware that this was the first time that he had been alone with her since those stolen hours in secluded corners of the Hogwarts grounds.
And wouldn’t those secluded Albanian woods have seemed an excellent refuge when, so much later, Voldemort and needed a place to lie low, undisturbed, for ten long years?
Every morning they made sure that they had removed all clues to their presence, then set off to find another lonely and secluded spot, traveling by Apparition to more woods, to the shadowy crevices of cliffs, to purple moors, gorse-covered mountainsides, and once a sheltered and pebbly cove.
There are no more uses of "secluded" in the book.
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She has been secluded in her bedroom since receiving the information.