There really is no way of knowing since you don't have any papers or have her history. How about posting a picture?
(P.S. I'm not an expert, but I'll be getting my first Maine Coon in about 2 weeks, so I've been doing a lot of reading too).
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...