I've only added the chromosome thing for clearer context, as, as I said, 5-alpha-reductase deficiency only affects males anyway. But sure, we can get back to that if something isn't clear here.
No, in my opinion Amal should not be allowed to participate in sports as a woman.
Yes, Amal should definitely be allowed to participate in sports as a man.
I don't understand the last question. What has nobody notices until now? Amal has definitely noticed “something is off”. After being mistakenly assigned female at birth, Amal might have not noticed anything until puberty. But then, when menstruation doesn't start, and instead external male genitalia do belatedly appear, Amal definitely noticed that — understandably very embarrassing and confusing — development.