chiropractors and osteopath's are trained to deal with these kinds of problems, physios also have some training, it seems however that it is often difficult to get these problems to resolve even after treatment from good practitioners while others quickly improve.
If your wife's hips are uneven its possible that she has some kind of pelvic torsion, its kind of an imbalance in the position of the sacroiliac joints, this condition, and scoliosis are seen together, there is a lot of argument going on in the medical community as to which one causes the other, and as to what causes them in the first place.
There are two different kinds of scoliosis congenital, and adult acquired, the first develops during childhood, and can get really bad, spinal curves of 70 degrees ,and more, the second curves usually don't progress past 30 degrees.
How old is your wife? has she had any accidents or injuries recently? does she have back pain or stiffness?
There is no concences on the best way to treat these conditions at present as your wife is doing physio at the moment you might want to give it a good chance to see if that works if you don't get good results i would consider seeing a chiropractor but i would be very careful on who you choose some of them seem more interested in advocating chiro as the best treatment for every medical condition around instead of concentrating on what some evidence suggests they good for that is some of the muscle and joint problems that affect the spine, and pelvis.
If you are struggling to get results don't accept that it will not get better when people tell you without trying all the options be careful always choose good practitioners.
Good luck.