Hm. Kendra's bridge into chapter books was the Rainbow Magic series. It's about two girls who find fairies. They're pretty commonly available, so you may well have already encountered them. I always expect them to be cloying and then they aren't *quite* as bad as I expected. Kendra started with "Ruby the Red Fairy," which is the first book of the (very long) series, and took off from there. If Cordelia is into fairies, then she might find these interesting too.