She's very typical for her breed, a lot of them were imported into the UK in the 70's and were the foundation - or part of - for the British Warmblood.
She has plenty bone (leg) for her build - she's just a bit overweight but work will sort that out
She looks to have capped her hocks - might be the photo but keep an eye on it.
Some horses just plain don't like jointed bits and are happier in a mullen or low port. If you decide to stay with the kimberwick then don't use the lower slot. I use this type on horses like that and if you have light hands the horse shouldn't back off from it. Korsteel Standard Kimberwick