Most of the free-to-play players wish for a character for the sake of collecting them, and having extra constellations are cherry on the top. If you have saved up some primogems and wished on a banner where Rosaria is also featured, then her second constellation is a good milestone to stop at. She's outstanding as a cryo support, and at her second constellation, her elemental bursts' duration is increased. You can benefit from that and have a cryo application on enemies for a longer duration. When using her with characters like Eula, you can take benefit of her abilities to funnel elemental particles to Eula and get burst back faster. I would say Rosaria is an excellent character and has used her recently against Hydro heralds; I'd say she's incredible when breaking their shields. I was able to 36-star the recent abyss after using Ayato, Rosaria, Chongyun, and Jean in a team. It is an extraordinary freeze team composition that helped me to clear the spiral abyss flawlessly.