Oh God.
Anna's extremely aware of her own nudity, and the near-enough state of the woman, curled foetal on the floor.
God she heard everything...
The shine of a ring torments her, and Anna feels disgusted, in herself and the man waiting. Not waiting for his wife.
Barely twenty and she's destroyed a family; Elsa's sheer lingerie is only a prelude to the positive marker, still clenched in her hand.
When the woman pulls her down and embraces her, Anna hugs back, if only because (as unfair as it seems)... her life is breaking apart, too.