Anyone know this book?
I'm looking for a trilogy about a female who grows up in the country and is rescued after some kind of raid and brought to the main city. Over the trilogy, she is trained in telekinetic (and other?) powers that are part of training to go into space. Only women can go into space. It's a matriarchal society and low technology. Based on their mind powers instead. They fly into space on crosses of special wood.
She's also been set up to compete with the top female from another group or clan.
Their planet is getting colder and in the last book (I think) they construct giant mirrors to reflect sun to warm their world. Later, they meet a spacefaring species that is more like us. After some attempts at peace, a war breaks out in which she wrecks havoc. Finally, she commits suicide to allow peace, if I recall correctly.