I like the muscling on her and she shines, reflecting good diet and grooming.
Confirmation, I agree with a long back, but I've seen longer. Some people actually prefer a longer back. She has nice clean legs and that's always a plus in any level of any discipline. Shallow in the girth and there is something off about her withers (I can't place my mind on how I would describe what I see going on there) Her neck is set on a little odd, and I think this has a lot to do with the wither issue I just mentioned.
Fortunately I don't see anything that would make her unsuitable for any kind of riding. (I see she is ridden English) What I really notice "wrong" with her is all cosmetic confirmation faults and nothing that would cause an issue in the long run. And something that is undesirable to one person isn't always to another. So if she works for you than I'd brush off any comments by anyone (including me) unless someone sees something that is more of a confirmation fault that causes lameness.
I'm also not an expert.