This is a complex question, as the advances of WW! need to be seen in the context of the wider moves towards women's emancipation and the advances in their social and political rights over the 18th, 19th and 20th centuries, as well as the ongoing challenges that remain in enabling equality of opportunity and the value of all citizens.
http://www.catherineofsiena.net/vision/f… has a list of some useful 'firsts' which show the issues that were deal with during WW1 (and also in its aftermath).
The 20th century saw the most fundamental advances in the cause of women's emancipation. One of the most important achievements was women's suffrage, which gave women a voice in Parliament. The campaigns of the suffragists and militant suffragettes, and the work of women behind the lines and on the home front during World War I, were rewarded by limited suffrage for women in 1919 and equal suffrage in 1928.
The war bestowed two valuable legacies on women. First, it opened up a wider range of occupations to female workers and hastened the collapse of traditional women's employment, particularly domestic service. From the 19th century to 1911, between 11 and 13 per cent of the female population in England and Wales were domestic servants. By 1931, the percentage had dropped to under eight per cent. For the middle classes, the decline of domestic servants was facilitated by the rise of domestic appliances, such as cookers, electric irons and vacuum cleaners. The popularity of 'labour-saving devices' does not, however, explain the dramatic drop in the servant population. Middle-class women continued to clamour for servants, but working women who might previously have been enticed into service were being drawn away by alternative employment opening up to satisfy the demands of war. Thus, nearly half of the first recruits to the London General Omnibus Company in 1916 were former domestic servants. Clerical work was another draw card. The number of women in the Civil Service increased from 33,000 in 1911 to 102,000 by 1921. The advantages of these alternative employments over domestic service were obvious: wages were higher, conditions better, and independence enhanced.
Mrs Millicent Fawcett, leading feminist, founder of Newnham College Cambridge and president of the National Union of Women's Suffrage Societies from 1897 to 1918, said in 1918: 'The war revolutionised the industrial position of women - it found them serfs and left them free.' The war did offer women increased opportunities in the paid labour market. Between 1914 and 1918, an estimated two million women replaced men in employment, resulting in an increase in the proportion of women in total employment from 24 per cent in July 1914 to 37 per cent by November 1918.
There are lots of books on the subject - major libraries will be a great resource for you.