1. Here's one credible article on cold weather laminitis. If you google, a lot of other credible articles will come up:) https://www.paulickreport.com/horse-...ter-laminitis/
2. If that is a fresh trim, there is still room for improvement on the farrier's part:)
There is still too much toe and some flaring. More hoof could come off (unless the horse is really sensitive to heel height, then trimming needs to be gradual but more frequent so as to make progress).
2.1 The roll on the toe could safely be more aggressive, IMO but I am not a professional.
My opinion is based on trimming my own horses for years, and what I see working for my foundered horse:). My horse wears a very aggressive roll and his hooves are happy that way --- many people might argue it's wrong but we have experimented and it's what works best for him, at this point in time. "At this point in time" being the operative:)
3. 10% - 12% NSC on your hay is pretty good.
4. Were she my horse, I would take her off anything in a bag that can be bought in a feed store because:
a). Too many calories
b). Soy is the protein source in nearly everything, unless you read the labels closely and it says alfalfa.
c). I might also consider taking her off any alfalfa for awhile.
4.1 I would, instead put her on https://horsetech.com/high-point-grass
. It's a vit-min supplement that does NOT use soy as the protein source and does NOT have added iron. You would only use three ounces daily so virtually no calories. I use straight Timothy pellets as the carrier for it and the other needed supplements.
It costs ~86 cents daily.
5. MSM would be a good thing to add for inflammation. I am also a big fan of HorseTech's "BioFlax 20" supplement but it's not cheap either:(
When horses are foundered this bad, my experience is nothing cheap is going to help them:(