With these and the radiographs, it's safe to say this isn't endocrinopathic laminitis, at least not EMS related. The best thing for her soles is described here https://hoofrehab.com/DistalDescent.htm .

It's possible she has either bouts of IR that accompany trying to ovulate or a systemic inflammatory response at that time. I don't know what blood testing is available to you but I would definitely have her ovaries ultrasounded to check for cysts when she's painful and consider having them removed. Otherwise, I sent you a link to a Chasteberry/Vitex product available in AU in an earlier post.
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Eleanor in PA

www.drkellon.com 
EC Owner 2001