Finland's Lotto Lepisto took third place ahead of defending champion Lizzie Deignan.
Netherlands controlled most of the 134.5-km race but they were eventually helpless when Dideriksen, the two-time junior world champion, burst from the middle of the road in the final straight.
The men's road race will be held on Sunday.
(Reporting by Julien Pretot, editing by Pritha Sarkar)
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