[1][2] She was born at Malone House in Belfast, the daughter of wealthy landowner William Wallace Legge (died 1868), a JP and DL for County Antrim, and his wife, Eleanor Wilkie Forster.

[1] She was a keen cyclist,[6] and one of her most celebrated moments was when the landlady of the Hautboy Inn at Ockham, Surrey, refused to serve her because she was wearing her "rational dress" of baggy knickerbockers instead of a skirt.

Pomeroy sued the landlady, but lost the case because she had been offered service in an alternative room, albeit one occupied by three men.

Her obituary in The Times says that she had written pieces for that newspaper to express the view that women could do more of the work currently done by men, and had also campaigned for reforms to prevent tuberculosis.

It ended by saying that: Thus by the death of Lady Harberton the "pioneer women" of the day lose a spirited, energetic and daring supporter and society a remarkable personality".