Women Who Changed Sci-Fi (bbc.co.uk)

... not quite elder enough just yet, but I would also add:

Mary Robinette Kowal - For her brilliant fiction and her work in podcasting and fan/industry outreach.

I would add Delia Debyshire - the performer behind the iconic Dr. Who theme.

https://en.wikipedia.org/wiki/Delia_Derbyshire

for me, Andre Norton

I feel like it's a bit premature to say Anne Leckie has changed sci-fi. I liked Ancillary Sword, too, but there hasn't been enough time to change sci-fi in the last three years.