Isabelle got pregnant with Alec's child, and Alec decided he wanted her to carry the baby to term and that they would raise it as if it was Viola's. This was too far for Viola, both because it was close to home with her own pregnancy trauma and because of how directly it involved her and how much it would demand her covering for Alec, so Viola took her money and Isabelle and dipped for the US, where she got Isabelle an abortion and some temporary housing. From there she got her into the uni where Cy teaches, and here we are!