Actually if you were living with her with her permission she can't just lock you out, she did something illegal, but it is a civil matter so the police will not get involved. You need to see a landlord tenant lawyer.
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Ms. Morcroft is correct. There is no right in Florida to a self help eviction. If you have been living with her (regardless of whether you paid rent or not) she must remove you in a legal manner.
Based on the information that you provided it seems that she would be liable for three times the monthly rent. I recommend you contact a local landlord tenant attorney to review your case.
Best of luck.
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You should go speak with someone at the local Sheriff's Office.
Sheriff, not police.
Ask someone at the sheriff's office if you may go back to the property.
Show them a piece or two of mail that was addressed to you at the address.
Show them your Driver's License with the property address on it.
Tell them how long you have lived there and that it is your permanent residence.
You should be allowed back in to get your stuff or to live there.
Call a local landlord tenant lawyer if you need help.