Is my guinea pig seeing something "supernatural"?

So I know this sounds crazy, but its hard to say what exactly is real and not real. So anyways, my eldest piggy (who's having these problems) is turning 8 years old in December, so I'm not sure if her age is related or not. We let all four of our guinea pigs run 3 times or more a day, and now our oldest refuses to come out. When she did, she couldn't seem to get past this "wall" on the carpeting. For whatever reason, she would stick her head up and rest on her hunches as if trying to see around/above this blockade. She sometimes started to backup when she got to it, with her head raised up, until she found a place to hide under. Now I dont care what anyone says because I've seen ghosts before, and it almost seemed like it may have been a child playing with her. I told what "it" was to stop, and Fluffy (the piggy) was able to continue with life normally. At the end of one night I was agrivated with the guinea pigs (we have two older ones and two babies-the babies are devious little things that wont go in their cage for anything). So I thought of an interesting idea. I told "it" to help me get the little ones in, and for whatever reason, it helped. In less than 30 seconds the two of them sprinted and ran right into their cage at the exact same time. (I passed this off as conincedene). Anyways, this has been happening for over a week now, and I'm not sure if its because its conincedence and Fluffy is old, or its something more...what do you think about all of this???