Gallbladder removal after ERCP

Is gallbladder removal essential after having ERCP To remove gallstones?

My wife had ERCP a couple of months back in the Summer after having severe pain and jaundice where she was in and out of hospital numerous times.

It was successful and she's been completely fine since. She was recommended to have her gallbladder removed but this hasn't happened yet. I'm worried about her having the operation due to the risks, but at the same time I'm concerned the stones could return and set her back if she leaves it too long.

Could a good diet/lifestyle keep them from coming back? Or is it better to have the gallbladder removed?

Any thoughts/advice would be much appreciated

Thanks