Hoo-boi ---- She foundered because she has insulin issues.
The indicators I immediately see are the cresty neck, she is over weight enough to give her a "water channel" down her back. She looks to have excessive fat pads in the shoulder area which are also typical.
When you say "next time you see her" so that means she is in a boarding situation? If so, I hope the BO is willing to help.
You're in Canada so you are probably already having pretty cold weather.
I have an insulin resistant horse that has foundered but I am in the south east United States where it is still "suntan" weather as far as you are concerned
also deals with an insulin resistant horse that has foundered. She is in Canada and will be a lot more help in terms of what to feed.
What I can say is to keep the NSC's (non-structural carbohydrates) as low as possible. That means you need to watch what goes into her feed pan, grazing time and whether she needs a grazing muzzle.
If the barn owner buys hay by the season, ask permission to pay to have it tested for value for horses NOT cattle. If the hay tests high in NSC value that means soaking the hay where I live --- I don't know how that gets resolved somewhere the hay freezes the minute it's dunked in water
Your mare looks like she would benefit from her hay being in several slow feed hay bags, hung in several places so she has to move. Something that is difficult if she is in with other horses. I wouldn't be surprised if she eats like every bite is her last meal --- that is typical of a horse with elevated insulin, which is why slow feed hay nets are a huge benefit for them.
She needs frequent and quality hoof care since she foundered in the past. Were there x-rays and if so, did you get copies? Several of us wouldn't mind looking at her hooves, including clear sole shots in good light
. Many times Hooves tell a lot more of the story than the person can
The bottom line is that less is more in the feed pan. IMHO,mane is teetering on the edge of possible founder again, if the pics you posted are fairly current.