Mitral restenosis+MR+PH

sir this is about my mother aged 49.she has undergone Closed mitral valvotomy in 1984.now developed mitral restenosis.now condition is this on echocardiography:
Mitral valve orifice area is 1.5 sq cm
no calcification,pliable.
Mitral valve pressure gradient 10 mm hg.
grade 1+Mmitral valve Regurgitation.
Left atrial diameter 5.10 cm(normal range 2-4 cm).
Tricuspid valve regurgitation 2+.
moderate Pulmonary Hypertension(systolic PA pressure 65mm hg)
LV ejection fraction 58%.
she is under digoxin,acitrom,bidurate,inj penicillin
sir is Baloon mitral valvotomy is indicated?
if she undergoes Baloon mitral valvotomy how much improvement she will get?
...please help.....