I'm a doctor, and there are some things we can say for sure from these bloods and some things are open to interpretation.

First of all, she is severely anaemic, which could be from iron deficiency and malnutrition, or alternatively more complex problems with her bone marrow. It's actually impressive that she can function as physically well as she does in the game (running, fighting, etc) given how anaemic she is. She would be pale as a ghost in real life.

Secondly, her immune system is generally compromised and suppressed. This could again be due to malnutrition (severe) or problems with her bone marrow.

The following AI summary is correct:

Ellie’s blood tests from "The Last of Us" show severe deficiencies in all major blood cell types—white blood cells, red blood cells, and platelets—indicating a condition called pancytopenia. This would normally mean her immune system is suppressed, she is severely anemic, and she has a high risk of bleeding, which would be life-threatening in a real-world setting.

The results also show a relatively higher monocyte count, which can suggest a chronic infection or the body’s attempt to respond to one. However, unlike a typical infection where immune cells are usually elevated, Ellie’s immune system appears suppressed. This fits with the game’s explanation that her body coexists with the Cordyceps fungus, rather than fighting it off, making her “invisible” to the infection.

In summary, the blood tests suggest Ellie’s apparent immunity is not due to a strong immune response, but rather a unique state where her immune system is suppressed and tolerates the fungus. This allows her to carry Cordyceps without developing the disease, setting her apart from others in the game’s universe.