Well I couldn’t not know what she was was reading especially after the book was deliberately (poorly) blurred out in post for this and other images in the set). So after fumbling my way around the Cyrillic alphabet and ultimately just reverse image searching the picture on the back cover, I found it!

The book is a Russian print of A French Novel by Frédéric Beigbeder (Source). No clue if it’s any good, but I’m content to have tracked it down.