"It is not a slight against you," she spoke softly, firmly, before linking her hands together in her lap. "You owe a duty of obligation to Starfleet, for the effort and credits spent in training you. I would join you but it is not wise at this point in time. We still do not have a plan with a greater-than-even chance of success. It is logical for me to stay on Vulcan to continue working on that problem."