Perhaps. Not in a patient's room, however. A cell phone is a reasonable assumption.
Because Alissa apparently now is in, and had previously been in, the hospital after surgical treatment for whatever it was that brought her to the ER (probably not "subsets genitive"
), an ER doctor is unlikely to be found negligent.
ER doctors are not held to the same standard of care as another physician might be. The role of an ER doctor is not to rule out all possible diagnoses but rather to evaluate and stabilize a patient. Unless the patient's condition warrants immediate hospitalization, an ER doctor will release the patient to the care of his/her own doctor. It is the patient's responsibility to seek follow up care.