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Since Tol Fuin used to be Dorthonion, maybe some of Ungoliant's offspring survived there...
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I don't think any of them have survived on the island. In TTT, JRRT states:
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But none could rival her, Shelob the Great, last child of Ungoliant to trouble the unhappy world.
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So Shelob was the last of the Great Spider descendants of Ungoliant. But how she got to the Mountains of Shadow, is completely unknown to me.