How do I combine the two organizations?

How do I combine the two organizations?

A requesters has previously used Zoho and now cant join my organization.  How do I combine the two so that she doesn't loose her previous information?

This is the email she is getting when we "invite" her to join.

Sorry! you cannot accept this invitation now.

Your email address is already registered as administrator under the organization amyjaekel. To join the organization Lexmark Carpet you should delete your existing organization amyjaekel.

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