The Hospital Nurse, works at the hospital that Archer and Ruth went for their cancer treatments. It is possibly the same hospital where Dr. Speltz works, and definitely, the same hospital where Lana's ear, nose, and throat (ENT) doctor works.
She presents a straightforward demeanor and doesn't beat around the bush. When she delivered the news of Ruth's fate to Archer, she simply said: "your friend Ruth, she's dead."