The Sentinels Gotta Fight Another Fight, Gotta Run Another Night

Once he was told she was not allowed in the pack's lands Castiel was not going to allow her to loiter. If there was a sickness in her she would not be given the chance to let the woman pass that to the Donnelaith woman. Castiel was close to them to ensure that the young healer was not injured. He sat impassive, a stone statue who truly did not care about what happened to the disrespectful wolf. There was in Castiel a great bleeding heart but he had hardened himself after the battle of Poughkeepsie. 

He waited until the young witch was ready to return to the packlands before escorting he brought her safely back to their borders, completing the task given  to him by Aria. He had kept Deirdre safe and he had ensured that the woman was no longer a threat to their pack. Should she show back up, Castiel would not hesitate to finish the job that the other wolves had started.