Nia's situation is a bit different, I think. Nia and Nika never talked when they were kids. If Marla was to be Summer's aunt, he would have to at least be aware of her. I am not necessarily against the idea that Marla may know Nika from earlier, just that the aunt Summer angle really rubs me the wrong way.
About the Vic accident car, one of those constants was the gun scene; Ocean just backed out of it with the S1 release. I don't think that whether she's her aunt by blood or marriage would change much. Elsa's mom weighed her daughter weekly and some corporal punishment was hinted at if she had gained weight. Now, Marla could be another aunt, one that only runs over young girls but doesn't give them anorexia, and it can work, I think; it just seems like an odd choice.
Now, here we agree. The addition of another Miss Marla is an interesting one. Stephanie as a character is one that's growing on me; she's having subtle - or not-so-subtle - advances completely unrelated to Nika that I'm finding very interesting. I agree that the way she speaks hints at a problem unrelated to Vic; it really does, and was my first thought as well, reading the scene, that maybe there's more than we first assume. My second one was the gun thing, and I don't hate it either; it's simpler, and I prefer simpler answers, but I don't think that it's more or less likely than any other.
Elsa is the same age as Nika I think and she is going to the same college that Vanessa goes, with name I don't recall, but in the flashback they are around 10-12 years old, Summer incident was 5 year before the story begins and Nika is 18. Summer may have been older but we see that Nika, Nami and Summer are on the same class, so I think that Nami was hold back one year and Summer and Nika had the same age. Time jumps seems a possibility but I don't think that these are gonna be the reasons.
Yeah just made this reference. But Marla could be another aunt, she not necessarily needs to be Elsa's mom.