It could be possible for Eris to serve the last proto-Hive, Taox, to have revenge on her corrupted species for destroying the proto-Hive and her allies, and maybe, [i]just maybe,[/i] Taox will enlist the Guardians to aid her conquest of revenge against the Hive.
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I believe somehow Taox will find a way for her consciousness to survive the destruction of her physical body and will eventually merge with The Hive or the Worm Gods (and then The Hive). This will ensure her own survival so long as the Hive continues to exist. Either this or she will have already taken on a worm to ensure her lifespan is extended and then will still eventually become a part of The Hive in the future.