Continuity mistake: When Lucille throws the pills to Marv, he catches it with his left hand (while holding a cigarette in his right hand). The shot changes immediately to a close up on the pills in Marv's right hand. Then in the next shot Marv takes the pills, but has to take the cigarette out of his mouth first.
Answer: Not much is given on Miho's story in the graphic novel. Some is given in the story "A Dame to Kill For" where Dwight explains he saved her life once. Frank Miller in the extended cut DVD commentary stated she was a demon, but that is never mentioned in the story.
MasterOfAll