It might not directly decrease one's pain… But it definitely went a long way in getting one to let go of all the anger that filled their mind.
Xuan was getting better and better with each day, and although a lot of the credit also went to her personality which had always been strong, a significant part was due to the orb at her waist.
And honestly… Daneel agreed with her, in regards to the fact that this was one of the best punishments that existed for someone who had done so much.
After all, being tortured to death and then being healed was no easy thing to endure, and it was even poetic, as it was what she had indirectly inflicted on Xuan, in the first place.
She was also right regarding the effects that the orb and that event had had over the Order and the rest of the Big Four, but one last push was necessary, and that was exactly the reason they were here.