Final answer:
The question lacks the necessary context or specific reference to a literary work to answer what Billy's daughter blames for her father's strange behavior.
Step-by-step explanation:
The question seems to be referring to a situation where Billy's daughter observes a change in her father's behavior and is looking for something to blame for this alteration in his demeanor. However, based on the provided excerpts, there is no direct information about Billy or his daughter's thoughts regarding the reason for his behavior. Therefore, without more context or a specific reference to a text in which these characters exist, it's impossible to accurately answer the question about what Billy's daughter blames for her father's strange behavior.
It's essential to match characters and situations to the correct stories, plays, or scenarios to provide an accurate and helpful response. The question seems thematic, dealing with the complexities of parent-child relationships and the impact of external events on family dynamics, which is a common topic in literature.