I agree that some of the photo comparisons were weird.
The rest however was indeed very convincing to me. Mismatched eye color, height and appearance untypical of that age, and cognitive tests that estimated a much younger age? That's not something you can just discard imho, and those are the metrics you can hardly fake.
> changing identity like this would have been spotted really quickly.
Unless the people close to her didn't have an interest in spilling the beans.