Dear friend, welcome to HCM!
With her heart problem. it is advisable to do the TKR in a big tertiary centre.
Almost all big centres in Mumbai/ Pune offer TKR. Packages vary with amenities and quality of implants and surgeon.
Deenanath Mangeshkar hospital at Pune, where I work offers reasonable packages and very sophistcated surgery and a good ICU
is also an option worth considering.
Costs vary around 1-1.5 lacs depending on the amenity package.
You can shop for a suitable centre as per your needs.
Take care and please keep me informed of your progress.
I hope to have answered your query satisfactorily.