In The Metamorphosis by Franz Kafka, why is the maid at the end not afraid or disgusted by him?

The charwoman was actually the replacement for the
in-house maid which had to be let go. The story describes her
as

This old
widow, whose strong bony frame had enabled her to survive the worst a long life could
offer, by no means recoiled from
Gregor.

Basically what this
states is that she is a typical and provincial character which lightens the story since
she maintains a static behavior and does not deter from it. She is the typical tough old
lady who has lived through too much to bother with something weird. She sees the real
Gregor, and not what he has become. She actually teases him and, unfortunately, was also
the one who disposed of his body when he was found dead. For her to be able to perform
these tasks without flinching is clear indication that she was tough as tough can get,
and that this toughness is what gives the humor to the story.