Oh poor thing. :( Sounds like she has had it tough.
I wouldn't use boots on her at all... The boots will trap heat in her legs which is not good for tendon and ligament injuries.
For management, cold water/ice boots would help take the heat and some of the inflammation away. Premier Equine do some good cold water boots which are handy if you don't have access to a freezer to store ice boots in. Cold Water Boots / Ice Boots
You could try magnetic boots. Animal Magnetism does really good ones over here, but depending on your area, you may know of a good local supplier.
Also, it might be worthwhile at looking into Photonic Red Light Therapy. It aids cellular healing and collagen production. I use it with great success on my OTTB who sustained two suspensory ligament injuries while racing. This lady makes a red light wrap which is pretty amazing. It can be used on horses, small animals and people too. Red Light (Photonic) Therapy | Red Light Therapy Kits, Perth