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She did not play a role in the regular time line, but according to Sailor Cosmos, she was a very powerful force of evil in the far future, where she caused war and destruction to the point that nothing could be salvaged even if the war ended.
Sailor Chaos was allowed to come into existence partly because Sailor Moon chose not to destroy Chaos and the Galaxy Cauldron, the result of the war between Sailor Cosmos and Sailor Chaos was never revealed.