That your mini started the lameness issues just recently points to a possible PPID component as that would have coincided with seasonal rise beginning in some horses. Do you have a case history posted for her? If so, would you please provide the link. If not, we really need one to help you the most.
You are already working on mineral balancing your hay so the person you are working with should be able to answer all the questions for you. Here is a post from Dr. Kellon that explains it:
How's the trim doing? That can sometimes also contribute to foot issues. Encourage you to post photos in the Photos section of ECHistory8 so the gurus can take a look for you.
Lavinia, Dante, George Too and Peanut
Jan 05, RI
EC Support Team