I'm so sorry to hear about your poor little one's accident! She seems to be coping well though and you're helping her out where you can.
I don't know if it's necessary or not but I happened to be checking out Hammocky Hammocks this morning for chinchilla accessories on the advice of another chin owner and noticed a product called Bumble Pads. They're designed for animals who have bumblefoot or who have had recent amputations. I immediately thought of Spike and wanted to mention it. Best of all, they're all handmade and they donate their profits to small animal rescues!
Hammocky Hammocks - Hand Crafted Luxury For Your Pet
Best of luck to little Spike and I hope that the terror of what happened fades quickly from her memory!