To me in the video she looked either under the influence or extremely exhausted, so if she went left onto Nebraska and then made it to the Avocado Lake area I think she was either disoriented, lost, confused and somehow made it there OR chose to go there because she essentially went past Selma and her home. I know her family says she wouldn’t go there alone but it was really early in the morning, her brother wasn’t home, she tried calling her sister (maybe to hang out just talk), maybe she couldn’t find anyone to hang out with her so she did decide to go on her own. We don’t always know what people are thinking or feeling.