I support your concern.
It is quite clear that she has developed permanent damage to her kidneys.
You must immediately start her on thrice a week dialysis
as once a week dialysis is grossly inadequate.
Secondly Kolkata has many centres like Fortis,Birla,Wockhardt where transplant is being done.
It will be best if she can get a donor from within the family,if not then you may go for unrelated donor.
All the best