Swelling in the feet and leg below knees

My mother 62 yrs old has a problem of swelling in her both legs and the skin like very shiny like a tomato skin.this happens daily  and the swelling becomes normal/ less after she wake up in the morning. We want to visit our doctor in person but since we have shifted to different place newly she cannot travel often. Hence need guidance to take any preliminary examination like urine test( what are the list need to be tested in urine sample) and also blood samples if any. She says urine frequency is normal as earlier. Note: she has diabetes , high blood pressure and cholesterol and taking proper medicine for the same. Kindly suggest so that we can get the results prior visiting the doctor and would be helpful for us.