Are you positive that Roz is a female? How did you find out? The reason I ask is that it's common for owners to have the wrong sex of their igs. It's also common for male igs to show no breeding season displays for years, and then one year, BANG they become extra defiant, more aggressive, and more territorial.
If Roz is a female, then this large behavioral swing needs to be checked out by a good herp vet.