Umu, characters aren't voiced by her. But instead are created to fit her voice. That's one hell of a star there.
(Side note: Just realized she voiced Female Hakuno of the fate series. My second favorite master.)
Her performance apparently endeared Nasu so much he wrote Morgan with her in mind. Perhaps the best call, when you listen FGO LB6 audio drama and she managed to be both Morgan the Winter Queen and Tonelico. In all due respect to Aya Endo.