Arena quarter horse mare

I have an approximately 22 year old mare, she determined by vet teeth examination. She’s a been there done that kind of mare in the arena. I can do just about anything to hear in my roundpen. Trail riding does not seem to be her favorite thing in the world. Therefore me and her do not click. She’s very loveable and friendly. She tries to be the boss mare of my herd. She is not the leader but she is definitely second in command. I recently got her this last May. My coworker’s fiancé was moving to town and could no longer keep her. She had one colt approximately 5 years ago. She was a great mama. In the past 5 years she just sat and was not used. She needs a job. I took her in May to start working on refreshing her. I sadly do not have the time that she needs. She seems to remember most of her training. She does neck rein and responds very well to pressure. To get her to move faster all I have to do is squeeze my heels and she goes. She has never bucked or reared when I rode her throughout the summer. I sadly do not know much about her. She has a lot of potential. I have close to $1,500 into this mare already. Looking for a good home for her. $1,000 obo