I tend to be a bit cheap, so take this with a grain of salt. You don't have any photos with any sort of contact on the bit, which is a bit of a red flag for me. She's very cute, but as a buyer, with her age, I wouldn't be willing to count on more than another 3 years of useful performance riding. None of your photos show good collection, which is unfortunate. Based solely off of these photos, I would presume that she is a western horse who goes western in an english saddle, and would not pay as much for her as I would for a horse with good photos (or videos) going well in both diciplines with appropriate tack and appropriate contact for the dicipline. At 17, where I am at in the northwest, I would expect to see her priced at 1500 to 2200.
Now, if you can show good collection and forward movement when going english, and a relaxed and calm movement when going western, that might be a little different. For a horse that displays the ability to allow a reasonably accomplished rider with professional instruction to do well in the ring around here for 4-h, I would say more around 2200 to possibly 3000 on the high end, but it would take a while to sell her at the higher end.
I am a 4-h leader in nw Washington, for reference.