Vit C is not recommended for an IR horse as it increases absorption of iron and horses do produce their own. Adding lysine may be of benefit but will really depend on what is already in her diet - extra not always better. Have you worked with anyone on balancing her minerals until this most recent spate of setbacks? If so, the same person should be able to help in adjusting things for her to optimize her healing so you aren't wasting money by taking shots in the dark.
The CleanTrax is a great, safe, effective product when needed - glad it was recommended to you.
How is Princess doing today? How are you holding up?
Hugs to you both.
Lavinia, Dante, George Too and Peanut Jan 05, RI EC Support Team