Hi Ya alfers, It is good to see you over in this part of the forum. I am so sorry that your post hasnt had any responses. I have been out of town on vac and am playing catch up now..lol!
My mom also has MVP and it is pretty severe to the point where she is having to under go valve replacements. She also suffers from high blood pressure and takes medication for this and also takes Lasix for fluid retention which is a constant problem with the MVP.
The only thing I would caution about is that going on an echo alone is not always correct in these type of dieases. I say this because my mom had an echo done in June that said her MVP had reached the point where she had no choice but to do the surgery ASAP. Her Cardiologist went in and did a cardiac cath on both sides of the heart and was taking measurements of her valves for the surgery when he came out and told us that her cath showed that echo was incorrect. She could put off her surgery for another year or two. Long story short...one of her valves isnt yet at the stage needed for replacement even though the other 3 are and instead of having to have the surgery twice, they are waiting and watching. But my point is the echo was wrong.
Now my mom doesnt have Endocarditis and from what I have read of it this is something that does require antibotics. Even if she has a suspection of having it they should put her on them because she does have MVP and that is high risk for infections. Granted I am posting to you a week late and you have done your research I am sure and probealy have already gotten her into a specialist by now. Please do let us know what happens. Take care