The aorta is like a braided hose. An inner layer, a fibrous reinforcing layer and an outer layer.
Like a braided hose, if fluid leaks between the inner and middle layer the pressure will peel in inner layer off the braid.
The inner layer can collapse into the flow path, cutting off circulation, causing everything below that point to fail due to lack of blood flow.
Spikes and sudden drops in blood pressure could cause her to pass out.
And oh, by the way, the blood can low leak past the fibrous reinforcing layer and rupture her aorta. She’ll be dead in seconds if this happens.
Are you still sitting there?
Tell the doctors already.
I have done what I can do. I don't even know where she is hospitalized but I put your description in an urgent email to her sisters (both college age).
I know about aortic aneurysms, my father had one that was repaired in time, but could have been a real mess. Since I haven't been part of this group long, can you tell me the source of your medical knowledge? I decided to pass the word before finding this out, but will share that with them as well if they don't move quickly.