I had a couple of occasions in my 20s when I thought it was a good idea to keep drinking well past being tipsy. I was NOT normally someone who partied often, or engaged in risky behavior, so no real explanation for how these things hapened. Only I know first hand that it is not that difficult to go from :Hey this is funnnn....to vomiting in some bushes, etc.
The only difference is most of us who did something similar just have a youthful memory of a friend helping us home, or stumbling home somehow and waking up feeling terrible the next day.
Thankfully I did have enough sense not to do this when traveling. I did go to all inclusive resorts a few times though, and some people basically spent their entire vacation inebriated. It is probably amazing we do not regularly hear about things going wrong at this type of resorts given all the partying and proximity to water.
The timestamps for the payments were in the afternoon, right? I thought I saw 3pm mentioned?
I'm a bit curious what the sailboat was, and if any of her friends know if she went on an excursion.