Did Linbin mean Shirley A Sahrmann and her brilliant book on Movement impairment syndromes? Maybe one should look more at the movement dysfunction / muscle imbalance / movement control side. I've had a lady of the same age who dances still but tango and latin american stuff, she has various "hip" pains and more..... And frog position during lifting the leg in tango. Not being specialized I got her to a praxis where the doctors do see alot of professional dancers and the physios are more in that direction. She had a muscle imbalance problem including of course pelvis-lumbar regions. Plus triggerpoints. I remember discussing excessive hip movements and joint laxity (particularly anterior) in ballet dancers once in a "kinetic control" course. Your dancers hypermobility and muscle imbalance has continued over years and I suspect a treatment direction of core stability/ kinetic control local stabilisers-global stabilisers/pilates is where this patient should head.