Shouldn't she be under 'N' with the other singers because I think the current way it's organized makes it harder for people to find her page?
She's listed in another section because the "n" that's used in her name is not the conventional "n".
That list is automatically generated so we can't do much about it. However the has been a redirect that has been made so that it is possible to look up Non by using the search box.
If you don't mind me suggesting, why not just list her name with the other 'N' names, but leave her name unchanged on her page? @_@;;
What do you think?