If you can get the TC senior, outstanding! That's great stuff.
Have we mentioned magnesium? Can't remember, sorry, without reading it all...so many laminitis/ founder threads on here right now. Magnesium for Horses | Natural Health for Equines
has good info and a link to a very interesting article.
If you Google ' MagRestore ", website which comes up has more info.
Magnesium can help her deal with pasture, along with the muzzle.
Now I really would like to see pics of the old girl and her current pedicure and footware.....