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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear about White Girl's problems. It is hard to say from a picture alone (one of the pictures is dark and hard to see), but since she is a white cat that has been outside (I assume since she was a stray), this could be skin cancer called squamous cell carcinoma. It is fairly common in white cats, that are outside, and get a lot of sunlight. It could be a precancerous condition, and in that case a medication called Onsior might be helpful. It is a prescription, so you could only get it from a veterinarian who has seen and examined her.
Has she had regular blood glucose readings; do you know if her diabetes is controlled and that her blood sugar is under 200? Her cloudy eyes, and her coat matting as you describe (an indication she is not grooming herself well) may be signs her blood sugar is still high.
Is she getting a special diet for diabetic cats? In some cats, diabetes can be controlled better if the diet is changed to a low carbohydrate, high protein diet.
Let me know what other questions I can answer.
I hope you were able to see my response. How is White Girl? Can I help with anything else?