I found these two snippets when the Hargreaves family were living at 10, Holt Street, as in the 1871 census. Apologies if you already know of them.
A death notice -
Burnley Gazette 26th June 1875
On the 7th instant, aged 9 months, Mary Emma Hargreave, 10 Holt-street, Burnley.
and this, which I think must have been written by Sarah's sister, Mary -
Burnley Gazette 8th April 1871
To the Editor of the Gazette. 10, Holt-street, Burnley. Sir, - I send you a copy of the Women's Suffrage Journal, soliciting your attention to the matter of which it treats. You are aware that the movement in favour of an extension of the suffrage to women-householders is becoming one of serious importance, and is actively supported by some of the leading politicians of the day, and by a large and ever-increasing number of distinguished literary men. Many of the best journalists of the day warmly support our cause, and if I ask you to do the same it is because I believe you to possess a thoroughly liberal and enlarged mind, and do not think that you will dismiss with contempt the subject in question, merely because it is one affecting the interests of women. I am, at least, sure that you will give the matter little of your serious attention and I earnestly hope that the movement on foot in favour of women will eventually receive your sanction and support. There is one faith that will never die out of my heart, and that is a faith in the process of ideas and the ultimate triumph of justice That women are unjustly dealt with - that their position in the eye of the law is a humiliating and a degrading one admits of no dispute. Happily for them, some of the best and noblest men of this age are beginning to see the necessity of making them socially and politically free. One half of the human race cannot be excluded from all direct action on public affairs without their interest suffering materially through that exclusion. I believe that if we advocate our cause firmly and persistently, we shall win the support of all enlightened and large-hearted men, and in the long run draw to our side even those timid and shrinking women, who, not knowingly exactly what we are about, have probably vague fears that we are drifting away into some stormy sea of politics that will know no harbour.
I am, sir, yours respectfully, Mary Hargreaves.