I checked with myFICO Customer Service and it appears they have been in touch with you and this has been straightened out. Let us know if not, proudparent78. 
First, let's hope that you were simply helping her order her report, since ordering someone else's credit report is illegal.
lexxpoke wrote:
This happened to me as well, I was setting up an account for my sister and my credit report popped up? I didnt log in my name by accident. We are twins with the same birthdate, but that was the only similarity. I used my cc to do it.
Now, some questions: 1) Is your twin sister's first name similar to yours? 2) Did you get your SSNs at the same time? 3) Have you both used the same billing address at one time or another?These are all things that can cause your credit files to be mixed at the credit bureaus if they're very similar. That is, when you order from myFICO, we send your ID information to the bureau for them to match it with your credit information. They match on name, address, SSN, birthday. In your case, it sounds like the similarities in this information between you and your sister are close enough that the bureau delivered your sister's report to myFICO instead of yours.
My suggestions: 1) contact myFICO customer care to advise them of this situation so they can lock the account to prevent any additional such mix-ups at myFICO, and you should receive a refund; 2) order all 3 of your credit reports from www.annualcreditreport.com and file disputes with the bureaus if you receive your sister's information; 3) when ordering your credit report, be sure to include any current or previous addresses that are unique to you. Regardless of the cause, the bureaus should be able to separate your information in their systems. Good luck!