Who is Sonia Nordquist from The Egyptologist and what is their importance?

Sonia Nordquist is a tourist from Minneapolis traveling with her husband, Len. She and Len meet Ralph on a ship and invite him to a séance. They later visit Ralph at his villa. Len dies while in Egypt, and afterward Sonia invites Ralph to live near her and help with the chores in Minneapolis. Ralph cannot accept because he has murdered CCF.