She could have
A mild case of Ehlers-Danlos syndrome. http://en.wikipedia.org/wiki/Ehlers-Danlos_syndrome.
I have had to explain it to two of my doctors.
I have it an have to sleep with a pillow propping my shoulder at night so it does not dislocate.
Symptoms vary widely based on which type of EDS the patient has. In each case, however, the symptoms are ultimately due to faulty or reduced amounts of Type III collagen. EDS most typically affects the joints, skin, and blood vessels, the major signs and symptoms include:
Highly flexible fingers and toes
Loose, unstable joints that are prone to: sprains, dislocations, subluxations (partial dislocations), hyperextension (double jointedness) [3]
Flat feet
High and narrow palate, resulting in dental crowding
Easy bruising
Fragile blood vessels resulting from cystic medial necrosis with tendency towards aneurysm (even abdominal aortic aneurysm)
Velvety-smooth skin which may be stretchy
Abnormal wound healing and scar formation
Low muscle tone and Muscle weakness
Early onset of osteoarthritis
Cardiac effects: Dysautonomia typically accompanied by Valvular heart disease (such as mitral valve prolapse, which creates an increased risk for infective endocarditis during surgery, as well as possibly progressing to a life-threatening degree of severity of the prognosis of mitral valve prolapse) [4]