What manga is this i cant remember the name T_T?

its a bout a girl being transported to another world where she dresses up as a boy. also when she gets their(her girl relative is with her also but she doesn't dress as a boy) they are in a desert and her relative is like sick or something so when she sees this guy she asks for help. i don't rely know what happens next but she somehow ends up as his servant.also she has some kind of power their and is i think worshiped by this clan who helps her when she is taken captive. plz hlp me find this mangas name!