I can't help specifically with your nurse but I would suggest that you have a look at the Scarlet Finders website http://www.scarletfinders.co.uk/
The website is all about military nurses and VADs and has masses of information about nurses during WW1 as well as guides for how to research them.
Sadly, Sue Light who created the website died a couple of years ago, so it's no longer being updated but is still a brilliant resource.