It is not your fault! Good for you getting those maggots off, do recheck regularly of course. And I am sure you will take very good care of the baby! Try and avoid peroxide going forward and stick to saline solution...you can make it easily...just google it for recipe or search forum here, and put it in a squeeze bottle to irrigate the wound maybe twice a day and then reapply the triple antibiotic.
Aww it shivering cause of stress or too cold. As you remember, a warm snuggly place...do you have a heating pad? Give it warmth and a place to move away from warmth. 95 degrees I think it still tiny and doesn't have its mommie now.
I know I like peroxide A LOT but I think it may be too harsh and drying and I dont generally see it recommended on this forum for chickens.
If you take good care of baby and make sure it has electrolytes (nutridrench, sav a chick or make your own) you might be surprised how fast it heals.