Hope she has undergone gallbladder removal for symptomatic Gall stone disease. 1.4 cm stone is unlikely to dissolve with any medical therapy , moreover if it is a pigment Gall stone made up of
calcium bilirubinate. If it is a cholesterol stone patient may have high blood cholesterol levels or this may occur in association with
obesity, the metabolic syndrome, high-caloric and cholesterol-rich diets, or drugs (e.g., clofibrate) or OCPs. After removal of Gall Bladder your chance of developing Gall stone is gone but other risk factors associated with high cholesterol level or obesity or metabolic syndrome remains as remains the risk associated with this conditions mainly cardiovascular risk. So you should have a check on your diet and also your blood cholesterol level.
And regarding cancer there is lack clear evidence regarding Gall Bladder removal and increase the risk of GIT cancers and Cholescystectomy has more benefit than the risk.