Stop reading books about furries...
Honestly though if she's reading on her own she's probably old enough for you to read it verbatim and explain the racist concepts and why they aren't acceptable/would have been put in the book. She's going to run into these concepts at school, better that she understands what is/isn't acceptable, and why, when she does. Of course, bed time, while reading a chapter of the book, may not be the most convenient time for that.
Expose and educate, unless it's mustard gas...or bed time.
