Thanks everyone.
I just got off the phone with my sister (the one that lives 5 states away from my parents, and not the one that lives with them). Apparently, she has sepsis again, this time triggered by the pneumonia she had around Christmas. This time the nurse said they don't think they will need to put a PICC line in. She also doesn't think the infection has remained since the last time she had it.
She definitely had a mild heart attack, but they think it has to do with sepsis (as well as the CHF), and not other causes. I hope, however, they check her for other issues with her heart. She has a lot of risk factors.
Sepsis is the 10th leading cause of death in the US, which is something I didn't know. I am hoping that they caught this early enough and they can treat the organ problems. I probably won't know more for a while, because last time it was just a wait and see. I can't see this time being much different.