your best bet is to go have a laser session or two then get the girl done again like on your ribs,but go to a artist that will take his or her time to really develop it. you have really bold lines and that took away from the original detail. the lines widened as the ink set, so given the approx years under the skin,you prob got that tat about 17-18yrs ago and the ink should be less concentrated. a laser session would do wonders and rid u of it. it should take no more than 3 sessions at best.
if you want that tat covered up,then go with a pure black,gray and white tat cover up. it will be easy to cover that up,you might beable to turn her into a skull and cross bones