Good above post.
Be aware that over all, the horse market stinks. Horses that sold easily even a few years ago can take a long time to sell now. Owners are free leasing out nice horses and giving away just to get out from under the bills. So 2 calls a month from serious buyers is not that strange. Add in limited interest in the breed/size, it’s actually a good response.
I agree trail riding through fields and out in open as much as possible will help sell her. Whether Pony club / eventing or low level dressage, being able to hack out and trail ride, preferably alone as well as in a group, is going to be the deal breaker or maker for many buyers. Almost any causal or low level competition rider wants to be able to do that with their horse.