My first post, few questions about my new bird

Hi everyone, I adopted a bird few weeks ago I believe she’s an African ringneck
The previous owner seems didn’t take a good care of her she used to be very scared of anyone (recently less but still won’t trust hands, and a bit shy).
She’s very quite and I’ll say very well behaved (lol) compared to conures and Quakers.
Is it possible to know her age? Her eyes are all black, and tbh I’m say her cos I’m not sure of sex the previous owner told me doesn’t have a black ring so it must be a female but it looks very young

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