We first hear from her in a chapter about "A Knot of Dreamers," in which she is mocked by Silas Foster.  
After this character tires of acting in tableaux vivants, she tells her friends a "spectral legend" about a man named Theodore who falls in love with a mysterious lady.  Later, this woman is eavesdropped upon by someone who takes a room in a hotel that happens to face her rooms in a boarding-house.  We first hear from her in a chapter about "A Knot of Dreamers," in which she is mocked by Silas Foster.  After she confronts some other characters at the base of Eliot's Pulpit, one of her fancy French shoes is discovered in the mud, after which her body is fished out of the river.  She drowns herself in despair because her half-sister Priscilla is beloved by Hollingsworth.  FTP, name this character from an 1852 novel, a woman based on Margaret Fuller who appears in Hawthorne's The Blithedale Romance.
After this character tires of acting in tableaux vivants, she tells her friends a "spectral legend" about a man named Theodore who falls in love with a mysterious lady.  
Zenobia