I hope all is going well....
I use the MALASEB pledgettes to wipe the feet, then the MALASEB Spray to spray on the feet and the body, and the MALASEB shampoo with a cool bath twice a week. This stuff is wonderful for yeast, bacteria and mange prone dogs.
When I adopted my boy he had mange for so long that he is scared and has bald spots so I got some NU STOCK that I started treating him with and this stuff is AMAZING!!!
I know the iver is a pain in the bum, I bought liverwurst and mixed it with the iver and rolled it into a treat ball and gave to him, because the liverwurst has such a strong smell he could not smell or taste the iver so you may want to use this as it is much easier to get down.
I would also switch out her food now thus not leading to more stress at a later date. I would try Wellness Core, GO, Merrick etc to help keep her immune boosted.
Also keeping your baby outdoors as an outside dog is very hard on her, she spends all of her energy trying to keep warm or cool and this is very hard on their poor lil system, because of the boxers short hair/coat they can not regulate their temps very well and as long as you keep her outdoors her mange will never go away guaranteed because of the stress of being outside and thus causing a low immune...vicious cycle and so you will now have to find a better place to put her where she will not have to fight the outdoor elements.
Good Luck