Kisame and Ishizu would find their conversation interupted (unless they chose to ignore it) by a quiet cough and the sound of shifting rocks.  Who knows how Kisame's Byakugan had missed her the first time - perhaps the pile of rocks covering her nearly from head to toe had something to do with it - but lying in a corner of the cave, unconscious, dusty, and very much the worse for wear is a kunoichi.  It's hard to gauge her appearance from this distance, and in the darkness of the cave, but she seems young.  A quick examination will reveal her to be in her late teens, have just-past-shoulder length black hair, and - perhaps the oddest part of the whole thing - be wearing a headband identifying her as a Hidden Mist ninja.  Her eyes are closed, and it is currently too dark to make out any more detail - plus she's still mostly buried under a pile of rock.