It matters not if you have been maintaining the engine with excellent oil/filter changes (I did as well and my still died at 76K miles - see my threads) but the issue is a defective two-stage engine oil pump design that has since been updated and corrected. All the new engines have this improved part among other improvements. This improved engine gets the unlimited miles/unlimited years warranty for you and any later owners to come so that is a pretty good deal. If you are worried about the car, trade it for something she likes and feels safe/comfortable in.
Sorry man about the cancer battle, that stinks! Cars/things are small potatoes in comparison.