Healthcare assistant Kate Middleton, 29, of Kingsway, Northants, can no longer access her photos or contact her friends on the site.
Yet her boyfriend, Jonathan Ross, remains on Facebook despite sharing the same name as the television presenter.
Facebook has refused to reinstate her since suspending the account on Thursday, denying her access to her library of contacts and photographs.
The social networking giant, which is approaching 600 million users worldwide, said that she had registered with a fake name.
Prince William will marry his fiance Kate Middleton at Westminster Abbey in April and Facebook has moved to stop anybody impersonating her.
Miss Middleton, from Wellingborough, Northants, said: "I still can't get on, I've had no contact from Facebook about the situation or what they are going to do."
"On Thursday I was logged in as usual all day, then I went out in the evening with friends and got a call from my partner saying he couldn't see me on there any more.
"I thought nothing of it but later that evening I came home and tried to log in but got an error message that said it had been disabled.
"Despite repeated attempts to reset the account and contact Facebook, Miss Middleton has been unable to log back in.
She said: "I have pictures of my nephew on there who is growing up, and all my contacts. Some of those people I haven't seen for 15 years since I was at school.
"I dont know if they ever do let me back in whether that will be saved.
"I'm trying to arrange a 30th birthday party in February and now I cant get in touch with half the people.
"They should have got in touch with me first, asked me to contact them within a set period of time and prove who I was.
When Miss Middleton looked at the help menu to find out why her account had been disabled she found it was because "the name under which it was registered was fake."
"We do not allow users to register with fake names, to impersonate any person or entity, or to falsely state or otherwise misrepresent themselves or their affiliations," Facebook stated on its site.
Last night a spokesman for Facebook admitted it had been an error.
A Facebook spokesperson said: “We review thousands of pieces of content every day and takes action to ensure Facebook remains a safe and trusted environment for everyone. Of course, we make an occasional mistake. This is an example. When this happens, and it's brought to our attention, we work quickly to resolve the issue.”
