Hello and welcome to HealingWell.
When treatment for heart valve disease includes surgery, it's performed by traditional surgery and minimally invasive balloon valvuloplasty. The mitral valve is the most commonly repaired heart valve.
Yes, she may have to have it repeated down the road as the Dr. stated. Medications would be up to the Dr.
I do not have an answer re Yoga but a good question for her to ask her Dr.
I wish her luck and she is fortunate to have a caring friend like you.