What books Yuka read was not something Itachi could control, nor did he see any use in trying.
Yuka had a stubborn streak a mile wide; the more you tried to restrict her, the more determined she was to read them. To put it bluntly, she loved going against the grain. Whenever things didn't go her way, she absolutely had to have the final say, or she would stubbornly dig her heels in and fight you every step of the way.
Given that personality, it was better to just let her be. Maybe one day she would get bored of it on her own.
Chapter 36