Jewels of Smoky Quartz by Anat Eliraz

SPFBO7

A world ruled by force and magic. A game which could have a fatal ending. She is just an ordinary woman - an emergency room nurse who practices martial arts in her free time. Teleported into a harsh, strange world and sold into slavery to the fighters' ring of Tur'an, she must use her wit and skills to survive. On the brink of death, she wakes up in a strange room - only to meet one of her captors. Now, he acts as her protector. Together they leave the city, but their journey will confront them with their own fears and deepest secrets. And through it all, she finds solace in an old tune. Not knowing yet how it will impact her life - and the lives of everyone else.