Hello, Welcome to Just Answer and thanks for your question. B-type Natriuretic Peptide (BNP) issecreted by the heart's ventricles in response to worsening congestive heart failure. Any level above 900 pg/mL indicates severe heart failure. Congestive heart failure can result in shortness of breath. You can read more about congestive heart failure below.
There is no way to say if going home is a good idea or not without knowing her entire medical history and results of all tests she as had. The clinicians who are treating her are the ones most able to say what is best for her. Decreased kidney function can also result in higher than normal levels of BNP even in mild heart failure.