I'm with smrobs. Something well-started green broke. Or broke horse left in pasture for number of years (bringing it back). I think OTTB re-training is not for everyone (definitely not my cup of tea), although some people do it and love it. Rescues sometime can come with mental issues, which will never be fixed.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."