Just like always. Your answer was complete and exact. The verb suffer is both transitive and intransitive.
I even learn from your examples. I did not know the world septic.
I agree that Anglophile’s answer is excellent. In this case, “She suffered appalling injuries.” means she was injured, while something like “Even a year later, she still suffered from her appalling injuries.” means the injuries were causing her discomfort or pain.
Just another use of ‘suffer’ to add to your collection. It can also mean ‘become worse’ ‘deteriorate’ as in - As a result of the new tax laws the profits in that company have suffered. Their friendship suffered because they lived so far away from each other.