She notices that you ́ve been rather fatigued lately and decides to have a talk with you. A good XO cant exactly have her captain ́s men(even if you technically aren ́t a part of the military, just a pharmacist from Heliopolis who jumped onboard while things were going to heck and ended up becoming the ship ́s only doctor since you had atleast a moducum of medical training) dropping from exhaustion, especially not now while the Archangel ́s on the run from ZAFT. She ́s just worried about you.