Who is Louisa Conway from Wieland; and Memoirs of Carwin the Biloquist and what is their importance?

Louisa Conway becomes Theodore and Catharine's ward after her mother's death. She is later reconciled with her father and left in Wieland's care while her father travels. Louisa's death is Wieland's most brutal murder. He beats her so violently her face is destroyed. Clara loves Louisa like a sister.