Hi,
I missed this post somehow...
Sounds pretty comprehensive (your assessment and treatment that is!)
I would say a lot of the imbalances etc are long standing. Finding out what is new is the challenge in these patients. Esp since she has been pain free until now. I have given up trying to improve these long standing things. I once had a patient who was in her 80s with a first time back pain and she had terrible scoliosis that never troubled her until then - it was an acute injury that settled within 2 weeks of rx.
Can you explain the anterior pelvic tilt yet flat L/S? How does that happen? There has to be extension happening somewhere...
I would try a manipulation. Childs in 2004 wrote a paper about using a clinical prediction rule for people with LBP who will benefit from a manipulation. Find it under pubmed. Goot go. Sorry!