Atrial Fibrillation (AFib) Support Group
Atrial fibrillation (AF or afib) is an abnormal heart rhythm (cardiac arrhythmia) which involves the two small, upper heart chambers (the atria). Heart beats in a normal heart begin after electricity generated in the atria by the sinoatrial node spread through the heart and cause contraction of the heart muscle and pumping of blood.

Depressed Reclusive? Really?
Alot of people in their 90s get short of breath for various reasons. Alot of people don't live into their 90s. Even fewer make it to 100. Without knowing your mother's medical history and length of time with afib, there is not much for any of us to comment on.
Maybe her doctor is saying she has no medical issues other than afib and whatever is causing it. Afib is not life threatening when treated. For those in their 90s, a cold is not a good thing though.
petey
jan