The biggest factor that changes is probably the relationship value between Alexia and Rowan. If you blame Alexia and show no sympathy, then the relationship will take a pretty big hit. It's a quick path to one of the twins' ntr routes, as that requires low relationship between Rowan and Alexia. Other choices can mitigate the relationship damage, and I'm sure at least Andras' punishment will corrupt Alexia, but there aren't any huge consequences beyond that. Some rare minor dialogue tidbits in a couple of places, depending on how it played out.Helyana Escape consequences.
I didn't help her, Alexia did. Curious about the consequences of the different routes. Are there any specifics depending on who to blame or are they more general ie, changes character, alexia corruption?
Rowan's guilt value probably also rises quite a bit with some choices, though I haven't really checked how much, but that can also lead to a minor side event chain later if you keep it high. But it's not the only way to raise Rowan's guilt.