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There's no "updating" of a sign-up. If she didn't use your link to make her one of your referrals, then she blew that part.
The only way to change how she's signed up would be to delete her entire account and then rejoin the site.
You can help the HubPages community highlight top quality content by ranking this answer up or down.
Ask your sister to contact us directly with a link to your profile and a brief explanation, and we can manually add the referral.
HubPages Chief Moderator
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