See notes in Ellen Buckingham Drewry's page.

An 1862 advertisement in 'The Saturday review of politics, literature, science and art': Volumes 13-14 - Page 311; from books.google.com:

In 1864, with her sister Ellen, Louisa was a founding member of The Working Women's College. (See image at bottom of this page.

An advert in in the 'Pall Mall Gazette', Oct 1868.

Louisa, aged 34, describing herself as a Professor of History offers private tuition at 15, King Henry’s Road down the road from her family home.

An advert in 'The Examiner' in Sept 1870.

Louisa, aged 36, offers private courses in History and English, in the family home.
Louisa was still living at 143, King Henry's Road, at her death in 1916.
The house still exists, and in 2008 was valued at £1.3 million.

From 'Our Corner'. 1883, edited by Annie Besant
(found in books.google.com - Snippet view)

"Miss Louisa Drewry has a clear voice, and manages it admirably. But, putting to one side other objections that are to my mind fundamental to this amiable lady's reading in public, she committed the blunder in art of reading a man's poem ..."

From Interrogating the oracle: a history of the London Browning Society
(found in books.google.com - Snippet view)

In The Spectator: Volume 94, 1905.

"Miss Louisa Drewry hopes to give some readings from the English poets in May and June. She gives Lectures, Headings, and Lessons as usual; examines; and helps Students by letter and in her Reading Society. - 143 King Henry's Road, ..."

Louisa was still advertising her classes when she was 82, in 1916, the year of her death.

Correspondence

Is the letter reported here from 'our' Louisa, or perhaps an American 'Louisa Drewry'?

In the 1911 Census - 143 King Henry's Road, Hampstead

Louisa Drewry	Head	76	Single	Teacher and Private means	b. Notting Hill, London
Ann Norton	Boarder	74	Single	Private means	b. Islington
George Edwin Whitley	Boarder	45	Married	Handyman	b. Lambeth
Elizabeth Whitley	Servant	47	Married 14	House Parlour maid Domestic	b. Ashdon, Cambs
Florence Amy Whitley	Servant	47	Single	Cook	b. Lambeth
Hilda Gertrude Whitley		12	Scholar	Daughter of Mr & Mrs Whitley	b. Brixton

Links in Google books - but books unavailable:

'The Journal of Education', Page 437, Education - 1916 (Death announcement)
"On July 16, at 143 King Henry's Road, South Hampstead, LOVISA, elder daughter of the late Henry R. Drewry, in her 82nd year."

'The spectator, 1917', Page 437, Education - 1916
"Books: The Library of the late Miss Louisa Drewry, 2000 Volumes, will be Sold By Auction, following the sale of the Furniture in the premises 143 King Henry's Road, South Hampstead, on Wednesday, September 17th, at 4 o'clock"

Probate

From freeBMD

Death: Sep 1916, Drewry Louisa, 81, Hampstead 1a 577