I do not grow rozanne, but I do grow several other species of hardy geranium, and they are all up and going by now. Some for quite some time. I think yours may be gone.
Come to think of it, I think I remember that I did grow Rozanne at some point in the past, but since it's not here anymore, I assume mine must have died too? It's a popular plant, so I wouldn't think it would be finicky. When something disappears mysteriously for me, I always assume it either rotted, froze, or some critter ate the roots.
When you say you pruned in spring, you mean cut back dead stems? That might make it smaller, but I doubt it would kill it.