Actually horse are amazingly stoic about pain. The fact that you are able to ride her, doesn't mean she isn't hurting somewhere, just means she may be hiding it.
I would get a chiro to work with her, and a equine massage for her. You would be amazed at the results.
You posted you were having problems. You were given suggestions and opinions.
Many of us are horse people of long standing and long experience. Which, in a nutshell, means we have been exposed to vets that don't have a clue as to what they are doing, especially if they are not an equine vet, but more of a cow vet, or small animal. We all have been around horses that proved to be having some serious problems, yet never really gave a sign that they were, or we have worked for training stables where that happened.
And we've seen the results too of horses started too young. And of horses with broken ribs, withers, vertebrae who are being ridden anyway, whose owners didn't have a clue anything was seriously wrong.
Horses make me a better person.