The quick definition: High blood pressure in the pulmonary artery, veins, or cappilaries, making the heart have to work harder to pump oxygenated blood through it. Because the heart tries to fix that, it enlarges itself and that threatens the heart and lungs and can cause a blood clot in the lungs and or heart failure.
This what we're dealing with right now. More tests to see how severe it is will be done.
She could need a right sided cardiac cath.
That's all we know so far, but we know it's much more serious than we thought at first.
Please keep her in your thoughts and prayers.