Losing good resource

My team lost a good resource; a resource full of talent and dedication to the work. But we couldn't retain because we couldn't find ideal work for her and even rated badly for her dedication. I can't explain, how much helpless I was feeling at that time. I know, I am reacting little bit but nobody can stop me thinking about the wrong thing we do in IT. We could have retain her just by being little honest while rating and providing good work or encouraging her leading a group of technical people to do something different. A manager should plan for individual team members to avoid such organizational loss.