Praise and petting her when she's obeyed has helped me control her quite considerably in another area. Before, she wouldn't listen when I wanted to leash her. Now, she almost does all the time. BUT THIS WAS AFTER I'D DISCIPLINED HER FIRST.
So I know that this other area can be controlled. I now use distraction techniques, ie., pretend I'm throwing a ball, which makes her change directions. I'm thinking, in this respect, of always carrying a little ball and bouncing it when she disobeys, or gives chase.
She's just excited, that's all. It's really not too serious, or else I'd keep her leashed all the time. I've been walking her in this same park for the past nine months without any incidents taking place.
BUT I JUST WANT TO CONTROL IT COMPLETELY, so guess I'm going to use that distraction technique, along with praise etc. I'm just curious about dog behaviour and how to explain this. I think she's just being territorial too, although seeing things in a different light.
Besides, I may be moving. Butthanks for your comments. We'll see what happens.