There is no notable or well-known individual by the name of Isabelle Deltore. It's possible that you may have misspelled the name or that Isabelle Deltore is a private individual who doesn't have a public presence.

If you could provide more context or clarify who Isabelle Deltore is, I'd be happy to try and help you with your query.

However, I did find a character named Isabelle Deltore from the anime and manga series "The Seven Deadly Sins". Isabelle Deltore is a character in the series, but I couldn't find any information on a real person with that name.