Secret sub or not, the conversation with veronica happens anyway. So, yeah, She keeps island4 as a one (of many) option, if things go wrong. But will Veronica allows her to join? It depends on secret sub. As of now, both in pure dom and pure sub paths, she don't have any redemption choices.
And regarding her relationship with olivia, you are right, I tried my best to fuck up their relation from olivia choices, for example, making her more sub, supporting kane choices, being in good alignment, not going for ap_1 (alessandra points) while playing as olivia and also going against female supremacy. But still, she maintains the same relationship.