What Causes Red Spots On Hands And Legs Along With Shortness Of Breath?

Hello! My Mom ( 65 years old) thinks she has diabetes. Since last autumn, she is checking the glucose using an over the counter machine and strips. Most of the time , while fastening, her test shows between 96-121. Later she felt dizzy, had blurry vision, almost lost her vision. At those moments her test was taking after food and the glucose levels were at 184 and 154 respectively. Moreover, lately, she discovered some red spots on the wrist, some fingers and on the upper legs. Came and go with no explanation or whit out eating the same food. Also, she developed a cough with breath shortening, most of the time before bedtime. Please suggest what to do. Thank you so much for your advice.