Hi, @otiff15.
First of all, I'm so sorry that your Grandmother has had this incident happen to her foot because of her neuropathy. I am not a doctor so I am not qualified to give you a diagnosis or a prognosis. But what I can say is that it looks bad. And since you said it's just getting worse, she needs immediate medical attention...especially since she is diabetic and wounds like that usually don't heal easily on their own for diabetics. Since you have difficulty getting her in and out of the apartment to get her to the hospital, are you able to call 911 and have EMT come and check her foot? A burn like she has (which appears to be a third degree burn) is considered a medical emergency. Meanwhile, Im praying for your Grandmother and wishing her all the best.