Question: In the film *[Triangle](http://en.wikipedia.org/wiki/Triangle_%282009_British_film%29)*, we learn at the very end of the film,

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>  that the Jess we meet in the beginning already went through the loop (maybe even all of them). She remembers what happens on the liner, and she must remember that her main goal was to stop the entire crew from stepping onto the liner.
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When the moment comes when the crew wants to be "rescued" by the liner, why didn't she try to stop them? She hesitates, but doesn't act on it. Why?

Answer: 
After watching it again (I felt a lot like Jess, herself) I realised that she does not forget the events that took place until she is back on the Triangle. We can see her very sombre in the beginning of the film (when we have no explanation for it).

The reason she voluntarily goes back is because of what The Driver says about Tommy: "No point trying to safe the boy, nothing anybody could do's gonna bring him back." If you look very closely, you can see the slightest hint of her expression changing, because she has a new idea. It's not her goal anymore to safe herself, she wants to go through hell again (figuratively speaking) in order to prevent Tommy from dying in the next iteration.

However, when she steps on the Triangle, she falls asleep and forgets the previous events (until it's far too late, when she begins to very vaguely remember), as if they were dreams. After she wakes up we see her brightened up significantly. This is when her new plan to actually *get* on the ocean liner is forgotten and everything starts anew.
Okay Triangle is actually not a time-travel movie even though it seems like one. So she actually is forgetting what happened before due to traumatic event stress and because of where she actually is. It's actually hell. Or at least it is Jessie's personal hell. Most of what we see is her replaying events onboard a ship named Sisyphus which is the king in Greek myth that was sentenced to an afterlife in Hades pushing a boulder up a hill only to watch it roll back down and have to repeat this forever. 

Here is the most logical set of actual events that actually happened. Jess was a shitty mother to her autistic child. She had him in the car and was driving to the boat when a pelican hit the windshield. She pulled over to throw the bird off a cliff but didn't wipe the blood off , probably because she wanted to make the boat. Her kid freaked out and she turned to yell at him and wrecked. This killed her and most likely her kid. Then the taxi driver shows up (grim reaper/Ferryman) and she goes to the boat. The rest that we see is her reliving the events and trying to change the outcome but it's useless because she is already dead and this is her hell. She never realizes this and the audience is never given the full explanation.