Did you get any kind of agreement drawn up, preferably in writing, or have any other documentation documenting your intentions? Something like a deed of trust?
Was it done through legal advisors or a DIY job? If the former, what was the reason given, did the legal advisor know the circumstances?
If not and it is her word against yours and would be very difficult to prove anything unless you can claim some kind of interest in the property.
Do you have it documented that you made mortgage payments? Who, if anyone, is paying the mortgage now?
Could it look like your mother bought the property and is letting you "rent" it out by covering the mortgage payments.
What would have happened if when the mortgage ended, was anything put in place for that?
What was the agreement, if any, regarding furniture and contents?
Why did she kick you out? Was any of it your fault, being completely honest?
Did anyone else live there with you especially any children?