I agree with cat owner again about keeping her in, especially as she's older and losing her hearing. That makes her vulnerable not just to cars but to any predators that might be in the area.
However, I would also get her checked at the vet. Kitties who want to be by themselves or who are desperate to go out may be in pain. They hide pain so well that we often don't see any symptoms until it's quite severe. Any injury or medical issue would also make her more vulnerable outdoors.
Can you see anything about the area where she prefers to go that could explain why it attracts her?
Trying to get her to go out on a leash and harness is a great idea. One of my kitties loved this once she figured out that it was the only way she was getting outside.
Or, if you're willing, you could build a catio or enclose an area outside so that she can still go out but can't roam too far.