She closes the door and leaves them alone. Annnnd now that she's given her room away she'll just, uh, find somewhere else to sleep.
She heads back to the other building and replaces the chamber pots there with clean ones. She empties the full ones into the larger barrels that will be hauled to the sea in the morning. She cleans the dirty ones off with stagnant water, and then, struck with inspiration, boils the water, in case that'll actually make them cleaner somehow. While she waits, she sits with the patients who can't sleep, sometimes praying with them or adjusting their blankets in an attempt to make them more comfortable. One of her patients seems to have died since she was here last, so she calls another nurse to help her carry the body out to the cart in another part of the complex. All of the people with blood pox are feeling better now, though, so she sends them to a different room and tells them that they are welcome to go home in the morning. Mahan must have done something for them, she certainly doesn't have the power to cure it that effectively.
There are still people who need things when she gives up and heads upstairs again, and the nurses still on duty can't realistically attend to them all. There will always be people who need things, and if she never ignored them then she would die down here, in this room, and would be unable to help any others.
She knocks on the door to a friend's room and explains that she's given her own away for the night. Her friend says that she is welcome to sleep on the floor, and so she sleeps.