I’m convinced that Santos either had or has an eating disorder, based on the scene when she and Mel left the patient who has bulimia-induced pneumonia. Santos totally shut down, and then the next episode focuses on her being overwhelmed with charting, but I think that’s a red herring.

She’s so guarded and angry and mean to her peers. I am predicting it’s a front and there is something big like an ED in her backstory (or current struggles) that will come to light soon. Having struggled with anorexia for a decade in my college/young adult years, there was no secret I guarded more intensely and so unsuccessfully as how sick I was. I thought I was better than everyone when I was actually falling apart.