Listened to the RaceHour podcast and they had Patrick Mullins as a guest, who almost forgot Augusta Kate had a Neptune entry and didn't even bring her up as a possible Mares Novice Hurdler, he mostly alluded her to be entered for this race only.
I've taken it literally and gone in at 12/1 without NRNB, simply because she is not 9 1/2pts worse than Death Duty, and with some small doubt that Death Duty may not even run in this race, likewise the same doubts you'd have about Augusta Kate running in the race, I don't understand the difference in price.