If she stood for 3 years before you got her, what she probably needs is to be fitter and better balanced. Each of the riders appeared to be riding off their hands not legs. Now, when you have a quick pony, it’s easy to get into the habit, but no matter, the pony has to move off the leg. I love her willingness to jump (a valuable asset) but she looks a few times like she’s going to the jump however she dang well pleases.
I like her and if I were looking for a fun “project” (which she would be, based on having had a long vacation, not a reflection on you) for a small adult or a brave good riding kid, I’d consider her.
Pros: Cute, wants to jump the jumps, decent mover (more dressage than hunters) decent jump when placed well, not division pony but local. Rides well outside the ring. While small, she’s solid enough to carry a fairly big adult.
Cons: Haffies are a bit of a niche market and they have a bit of a reputation for devilishness. She appears quick and doesn’t bend or supple.
Marketing advice: Get a good dressage rider on her to get her responsive to the leg, bending etc. Try to get her to appear more “soft” to ride. The young lady I saw riding her appeared braced against her with a high wide hand. Even if the horse is kick along quiet, that makes me feel like it’s not. As she gets fitter, she might get quicker so she might not be a novice friendly pony. There is a market for ponies that can do it all for adults who don’t mind a challenge but who prefer to be closer to the ground while facing it.
Apart from the videos, what are you doing to market her? Are there any trail riding clubs, pony clubs or such around? Barns that have foxhunters often have pony clubbers and eventers and all round pleasure riders. Are there FB pages for local clubs or groups? A local hunt?
The H/J show world is populated by people accustomed to a certain “look” about their horses. Above the local level “unconventional” breeds can be a tough sell.