Can you take some better pics? Your light source is directly hitting the area we need to see well.
Does she still have mange? Are you sure it IS mange? It usually makes their ear tips look almost crispy and hers don't seem to.
If you can get some assistance and some heavy gloves, it would be GREAT to be able to wipe her down with diluted Betadyne solution - it will deal with both bacterial and fungal issues, AND, it will help to get some of the gunk out of her fur, which is probably dried serous fluid weeped from the skin. Get 10% povidone iodine (Betadyne is the brand name) and dilute at the rate of about 25 drops per 1/4 cup water. If you can heat it so it is just about the same temperature as the squirrel (shoot for 105-110). You want to saturate the skin. If you can, I would get the area fairly wet with the solution, set it sit for a bit, then rub and wipe at that matted fur with a washcloth. When she is about to explode and kill all of you, go over her real quick and make sure you get the skin wet, and then just leave it. Make sure she is nice and warm until she dries.
Make sure you have bandaids. Tape. Gauze. Tourniquets. Rum or vodka for afterward might not be the worst idea.