Thanks for your query.Based on the facts that you have posted it appears that your nan hasObstructive jaundice
due to stone in common bile duct and has undergone ERCP .
Her appetite has improved which is good sign after ERCP as biliary drainage
is restored..Yellowish Discolouration of eye due to jaundice takes about one month to get cleared completely.
As regards her deranged kidney
function it is most likely to be to toxic effects of multiple drugs she is taking and will get resolved with treatment and stopping the drugs .
Please keep her under observation of qualified general Physician or Nephrologist