I find it weird that she (suppousedly)ends behind the dumpster regardless if you rescued her earlier or not.I mean.. I didn't save her when I just did Val's path but from what Ethan said sounds like he raped her for sure. I deff need to do the (almost) step-sisters path as well to see what you mean bout the cara bit.
In the path where you save her she goes back to living with her mother and nothing out of the ordinary has happened for the time being, Ethan is still on his mission to fuck her.
In the path where you don't save her, his words make it seem like without the MCs support she caved to his demands, so why would she be behind the dumpster too?
Maybe Nyx is starting to have trouble splitting the many paths...
For Val to show up you need to do the rescue so that the fight can start, and high points with Val(no idea what the cut off is), otherwise John, Iris's Dad, possibly Erynn too,makes the save.
The sisters are just good times with them, doesn't mix with anything as far as i can tell.