the idea that a 9 year old girl is mature enough to think and make a decision about having sex

Eh, that's not even the issue. That's what we say about teenagers in the "statutory rape" age range. Sure, they can't consent.

Unless Aisha was a unicorn, a 9 year old girl, of any ethnicity, in any era, is unquestionably prepubescent. She won't be physically much different than a 9 year old boy. Someone "having sex" with her is not just abusing her, but is a perverted pedophile.