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Hard sci-fi novel. Protagonist uses a wormhole portal and discovers a second version of herself (sister? clone?). May also feature tree-like alien life forms.

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  • That is as vague as "looking for a sf book about a robot and fantasy book with elf in it." Anyway, check does anything on this list look familiar tvtropes.org/pmwiki/pmwiki.php/Main/AlternateSelf – Yasskier Jun 24 '20 at 2:52
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    Reminds me of Proxima, by Stephen Baxter. I recall Stef the scientist suddenly gains a twin-sister when she accesses the wormhole portal entrance found beneath the surface of Mercury. The twig like aliens are called weavers. – Handsome Jim Jun 24 '20 at 16:06
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    Proxima! That's it! To those for whom the clue was insufficient, if I had more, I likely would have been able to locate without help... Thanks Handsome Jim! – Echo144 Jun 25 '20 at 15:11
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As suggested by user Handsome Jim and confirmed by the OP in comments above, this is Proxima (2013) by Stephen Baxter.

Per the blurb on the book's goodreads.com page:

The very far future: The galaxy is a drifting wreck of black holes, neutron stars, and chill white dwarfs. The age of star formation is long past. Yet there is life here, feeding off the energies of the stellar remnants, and there is mind, a tremendous galaxy-spanning intelligence each of whose thoughts lasts a hundred thousand years. And this mind cradles memories of a long-gone age when a more compact universe was full of light... The 27th century: Proxima Centauri, an undistinguished red dwarf star, is the nearest star to our sun. How would it be to live on such a world?

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