First, talk to the lovely Raisa.
Remind her that whatever happens, you are acting with the best intentions.
Tell her you'll leave CoC out for her.
Make her very aware of the potential consequences of reading the book.
Make it clear that she should only read it if she's prepared to cope with the candid information presented.
Leave the matter with her.
The decision is then hers.
(That's what I would do anyway.)