You might try a grazing muzzle and I've had excellent results with the Laminitis herbs from For Love of the Horse at
www.forloveofthehorse.com I have all my laminitis and cushing's cases put on it. For laminitis it is the difference between horses being down for months or getting up and walking after just a couple of weeks. I'm certain this mare probably was insulin resistant early on...an "easy keeper" as you will. I find they transition into Cushing's quite readily when they age even if they never did founder earlier.
I can absolutely see your point, Meg, the problem is that none of these horses are mine, they belong to friends, so I can make suggestions but have no actual say in what happens....... Cathy likes her horses to have as 'natural' a time as possible, so she's so far been resistant to suggestions by myself and others about trying strip grazing to stop them getting so fat, in fact she's ultra paranoid about them getting a little 'poor' over the winter, so I can try to tactfully suggest a grazing muzzle but am not too hopeful she'll agree to it.
More than LouLou, the size of Coconuts concerns me, as she's only about 11 but her legs are clicking, she has a huge thick crest on her neck..... I feel she should be at least be working off the weight, and actually offered to buy a little pony trap for her this weekend (Owned by one of Mick's friends and a very good price) but it was turned down. There's no-one really small enough to ride Nuts, I have ridden her in the past and again I offered to start going over at the weekends to restart her on little trips out or over trotting poles and around weaving poles. The trouble is that once Cathy has done a little groundwork with Lola and Luna (who are no nearer being under saddle than they were last year) and done the poop picking, that's it for the day.
Again, not my horses, so frustrating that they haven't even been taken out of the field on a lead rein to get them used to following Joey and familiar with being out on the road, I suggested long-reining, not taken up, so instead they are busy learning to hold up a hoof or touch a cone with their noses on clicker training, have they had their saddles on? no, but look at these tricks they've learnt! Even if I went over every weekend anyway, from experience last summer I can guarantee lots of obstacles to actually getting a saddle on any of them!