Agree with a lot of advice posted here.
There is a general misconception about where and when value is added to a horse, and how much. You’ve added some value to the horse in taking it from an unraced TB to a greenish novice friendly show prospect, but the real uptick in value comes with show mileage and a show record or finishing it in its discipline. The training period where this mare moves from where she is now to where she can pack a timid rider around 3’ with auto changes is where the value curve steeply ascends. (Partly because it’s more difficult and fewer horses are capable, partly because it’s an expensive journey.)
I bought horses like this for $1500 - 3500; kept them in my lesson string for the better kids, put working students on them, hauled them to local shows if there was space on the trailer and got as much mileage and exposure on them as cheaply as possible. At the end of 18 months, I might have a career school horse, a nice local 7 - 10K horse or possibly a prospect for fancier things.
I agree with hauling to horse to a pro barn where a buyer can look at her along with some other prospects. Lots of people aren’t willing to burn gas and time to look at one horse at a time.
JMO, as far as her description, the thing that jumped out at me was that she has leg yields and flying changes plus just started jumping 2’ - that’s an odd combo. Are you primarily a dressage rider trying to market a hunter? Is she only a beginner friendly horse on the flat? While I personally would rather have a horse with the better flatwork foundation and less jumping experience, a more typical training progression would have her jumping more before establishing changes. It may make sellers wonder if there’s a reason why she’s only jumping 2’.
Also, if you say she has good form over fences and shows scope free jumping (that’s another odd one - I want them to have scope when I’m ON them!) have a GOOD photo of her jumping that backs up that assertion. I might pass over the ad as written without a photo, or if the photo showed meh form.
Good luck with selling her, she sounds like a nice girl.