<<<<<They drained 2 litres of pus from her chest.<<<<<
Do you mean inside her chest (which I doubt) or do you mean over the breast where she had her lumpectomy and nodes removed? I would guess the latter and my comments will assume the latter
This certainly sounds like a post-operative infection which came on a couple of weeks after her operation......a long time after I appreciate.
There is nothing more than I can say with the information given, but it should soon settle with drainage and antibiotics. Septicaemia is a possibility, but there is nothing to suggest this at the present time.
P:S 2 litres of pus is a lot...........are you sure that there is no exaggeration here?
Interesting case.....keep me informed.
Today will show how the "cookie is going t crumble"