In Chapter 2, the list of dead patients written by Mother Elizabeth contained the name, "Lena Ashdown." Maybe Hugo Ashdown had a sister, a significant other, or other close relative? It could be that this person was affected by Hugo entering the Veil (just like Anna Beechworth was affected). Perhaps she was killed or brought to the Veil like Devitt? Perhaps it's a coincidence, though it would be highly unlikely.

Causes of Death
Chapter 8
It is implied that Lena and Hugo Ashdown were either married or close kin.