It's exactly the sort of text Regan needs. Spending time with Greta and Saoirse has felt strained. Maybe just for her, but there it is. She feels wrong around them right now, guilty and terrible, and even though Saoirse absolutely doesn't blame her, and has made that clear to her, Regan has a hard time looking at her.

Because it is her fault. Greta had been right about that, whether or not she'd said it outright.

So when she gets Rosie's text, she responds I can figure it out! and heads out of the cottage to make her way to Rosie's new place. Tinkering is a hobby of Regan's, so she doubts this will be difficult.