One of the ways to spot the Maine Coon is by the M marking on their forehead and this girl has it. If she is pure breed, no way I can tell by that photo. If Maine Coon she she be larger for her age compared to other cats, nice dense bones (solid when you pick her up) and have a pleasant personality towards people (if not abused).
Course I could be completely wrong, I would suggest contacting a kindly Maine Coon Breeder and see what they say. Or your Vet.
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