Arwen nodded, she helped the Doctor drink the medicine. "I will be fine." She forgot momentarily that she was a Time Lord. "Right now you need to get better." She was glad that they were able to get this to the Doctor in time and that he could now get better. 
Jack was helping to make sure that the Time Lord was taking the medicine. His attention was on Ianto who had told him that Owen had fallen asleep. "Let him sleep. He did well and I will make sure to thank him. But thank you for what you did today." He turned his head to face Arwen and smiled. "And thank you Arwen." Jack told her. 
The young adult nodded. "Should thank the TARDIS. She found the cure." She told him.