Liposuction is a wonderful procedure that I perform virtually daily. It works best for localized areas of fat accumulation. However, refined shaping of the thighs and legs may exceed the capabilities of both the technique and the surgeon, which may explain the response of your local plastic surgeon. It would be worthwhile obtaining other opinions by other board certified plastic surgeons. However, if you get several similar opinions, then I would be leary of putting your daughter through a procedure that risks either real disappointment or creates a deformity that is impossible to correct.
My calfs are small also so my knees really stand out.