you are more susceptible to pneumonia if you are currently in poor health. i think that there's multiple issues going on that we aren't aware of
Perfectly healthy people get pneumonia, it's just
less often. saying "She got pneumonia, therefore she must be SUPER DUPER unhealthy in the first place" is completely fallacious. It is not an indicator of health.
Pneumonia also isn't even remotely fatal unless you have tons and tons and tons of medical issues. Literally the worst thing about it is the symptoms. Assuming she
does have pneumonia, she's going to be fine.