This is called the Lady Hope story, and it is false. Even if it were true, it would not invalidate evolution. It would be like if Isaac Newton recanted on his deathbed, and someone claiming that now gravity was incorrect.
Even most major creationist organizations no longer use this as evidence against evolution. (Answers in Genesis, Did Darwin Recant?, http://www.answersingenesis.org/creation/v18/i1/darwin_recant.asp) (http://www.talkorigins.org/faqs/hope.html)
Please see here and here for further refutations of this claim.
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