Haha I can give some insight from the other side of the tracks. I am one who is over talkative when nervous, when excited, when something new or different happens, or when I meet new people (basically all the time lol). Sometimes I need the "I really have a time limit, but I will talk to you later" to snap me out of my being nervous or whatever, and give breathe and relax, so next time I see them, I can make sure to ask THEM what is going on ect, and listen to them talk. As long as you don't shut her down completely, but just kindly explain that you just want to spend some time with your horse, or whatever, I think that she will be fine. If she's just trying to fit in, in a few weeks, she'll calm down a bit, and/or run out of stories, and you can start actually sitting and talking with her or whatever without being stuck there until she's quiet. I personally would much rather hear a "I've got a time limit, or just want to spend some time with my horse, I'll catch you later", then an obvious show of putting in earphones, or answering a phone that didn't ring. As long as you follow through occasionally, and go up to her when you have time, and ask her to tell you the story, or ask her whats going on, I think that would be a better approach.