That's definately interesting!
In the good old days (when I worked!) we didn't automatically put a cone on the animal. Some of them never bothered their sutures. Sutures usually came out in 7-10 days and I also wonder about keeping them all covered up. It does seem like it would be a good moisture trap that could cause problems.
BUT, if that's what your vet told you to do then I'm not the one to question it! Hope all goes well and that she heals nicely.
RIP Wallis, John Robert, Tibby & Pip
Mom to JoJo, Roxie & Linguini (Cavaliers)
and my birds Moji (Senegal) and Walter (Blue Front Amazon)