Lady Aberdeen 1857-1939

I have visited the location shown below but have been unable to locate this plaque there.

If anyone locates it and takes a clear close-up digital photo of this plaque
(see location below) and emails it to me (see menu above for address),
I will post it here and give that person credit as the photographer.

Plaque Location

The City of Ottawa
On the grounds of Rideau Hall, 1 Sussex Drive

Plaque Summary from the Ontario Heritage Trust's website

Widely respected for her organizational skills and strong commitment to public service, Lady Aberdeen served as president of the International Council of Women from 1893 to 1939. During the Earl of Aberdeen's term as governor-general, she helped to form the National Council of Women of Canada.