Loved this. Strong female lead - and v. believable. Written by a male author too. I often steer clear of 'hard' SF, often seems a bit mechanistic, but this is beautifully written, and not only are the characters really well drawn, but Mars itself is also a wonderful presence throughout.
The whole thing is evocative, human, sad, triumphant, and at times that kind of 'uncomfortable scary' that just gets to you. I honestly don't see why anyone who likes SF wouldn't read this. It's a cliche, I know, but I almost literally couldn't put it down.