In reply to Jonathan Gardner.

If that!
A mezzo soprano should have a usable G5
Her range is consistantly more like that of an alto (not a contralto, as contraltos though singing low and dark have a wide range of 3+ octaves), a chorus part of an octave (or less) A3-A4. Anything above A4 is strained, and often anything around or below A3 is unsupported and foggy.