I don't know how old she was. She says she was a young girl in her diary so I think maybe between 5 and 10. Really, at any age, it is never appropriate for a young girl to shower with her father. Her diary says she started showering late at night to avoid him getting in the shower with her.

What he did to his daughter highlights his sick obsession with young girls, mostly. Hugging them and sniffing their hair and touching them whenever he has the opportunity. What a sick man.