In what ways might anna's infection have played into her untimely death

Aside from Anna’s sickle cell disease and type 1 diabetes, she also has urinary tract infection because of weaken immune system. Her infection was cause by Serratia marcescens that led to a severe infection or septic shock, which then impaired the function of certain cells or cause multiple organ failures and the untimely death of Anna.

i'm pretty sure it's spores