Need clarifications for urine color.

My mother has been experiencing frequent changes in urine color for some time. The urine is often dark yellow or whitish, and sometimes light yellow. She has been on diabetes (sugar) tablets for the past 6 years. Her sugar levels are generally under control. There are no other noticeable symptoms such as: Burning sensation while urinating Pain Fever Swelling Weakness Weight loss An important observation is that after drinking sufficient water, the urine color becomes white/clear, which suggests a relation to hydration. She is otherwise doing well and does not have any major complaints apart from this urine color variation. We would like to understand: Whether this could be related to dehydration, diabetes, or kidney/urinary function If any tests or medication review are required