She's the One Who Won't Behave

Gypsum, the sixth of seven sisters, has always been a rebel. Yet no one thought she would go so far as to join the reczavy, a group living in tents on the edge of the desert and known for their sexual promiscuity and playful ways.
But as the date of the Mongols' return draws near, Ilarians of all types must work together if they are to have any hope of surviving. And the reczavy, for all of their odd ways, do have plenty of tricks up their sleeves. Well, up their sleeves whenever they are bothering to wear clothes, that is.
Gypsum is touched when her oldest sister Ryalgar comes to call, and brings an olive branch with her. Ryalgar recognizes that the reczavy have as much to lose as anyone, and as much to contribute. Will Gypsum accept a key role in the plan to stop the invasion? Of course she will.
Unfortunately, her playmates don't all feel the same sense of urgency. Many would rather simply enjoy the time they have left. A few claim to be allergic to long term planning. And some are too busy with their own poorly-timed plans to overthrow the government Ilari already has.
Good thing needlepoint is the one traditional skill at which Gypsum has always excelled. She will need to thread a fine needle in order to coax this recalcitrant group into becoming life-saving warriors of a very different kind.