Earlier today, I talked with my cousin and with my son and his girlfriend, all of whom have been to Memorial Park in Athens and have seen the bathroom area near where her glasses were found as well as the lake area. I asked if it would be easy or if they thought it probable that Cayle could have just slipped into the lake and drowned. All three said, "No". My cousin went as far as to suggest that the "lake" which she would refer to as really more of a large pond, probably was not even deep enough to be over waist deep at its deepest point. (her opinion)
If I remember correctly it was from reports from Cayle's website and online in the Athen's Banner Herald which suggested that relatives felt that, due to her Bipolar, maybe she could have become disoriented.
Look at the photograph of Cayle at the park with her dog, on her website, (link in an earlier post above) taken the day she went missing. There is an 'out of kilter look' or unusual body position as if she was startled or being pulled forward suddenly by her dog on the leash. It could have been simply a bad candid photo showing her in the background, or she was having issues with disorientation or possibly an unruly, un trained dog was leading her around the park, not the other way around.
At best, all of the above is based on only on opinion, which as we all know, everyone has one, so I'm not sure how valid it is.