When you are blocked by someone on Facebook, there are few options to unblock yourself. In fact, unless the person unblocks you on their own, you can't become unblocked on your own. There is one thing that you can do, that requires setting up a new Facebook account. You can use your same name, but you must sign up with a different email address. Once the new account is set up, you can proceed to contact the person who blocked you. Keep in mind that the person may see your online attempts to contact her as harassment and may block your second account as well.
Go to facebook.com and fill in the "Sign Up" section. Enter an alternative email address that isn't attached to an existing Facebook account in the "Your Email" and "Re-enter Email" fields.
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Click the "Sign Up" button once. Enter the Captcha security code in the text box and click the "Sign Up" button a second time.
Complete the Facebook account registration and find friends, add profile information and upload a profile picture. These items are optional and you may add them at a later time.
Click the "Save & Continue" button to finish.
Go to your alternative email account and retrieve the Facebook confirmation message. You will need to click a link in that email before your new Facebook account becomes active. Once the account is active, you can contact the person who blocked your other account.
Only use this method of creating a second Facebook account if you have a legitimate reason to contact a person who blocked your original account. Do not use this method to harass people.
Cyber-bullying is a serious offense and may be deemed unlawful in your area. Check with your local authorities and statutes to determine your rights.