Despite her complicated medical history the endoscopy does not have such a serious risk. On the other hand the black stool means an internal bleeding and if it is not checked, it can be life threatening. So a choice has to be made. A small risk of endoscopy has to be taken so a bigger risk factor can be treated. Hopefully everything would be fine and she would tolerate the procedure well.
Please feel free for your follow up questions.
At this point, with this bleeding going on for over a week now and no action has been recommended by the docs until now - what other complications could we be facing?
Anemia and associated complication of congestive heart failure (previous heart condition contributes to it) is a possibility.
It is privilege and pleasure assisting you.