kavan,
IF the OP posts xrays, both front and side and it shows abnormal growth of one side of her mandible, would you not change your opinion to NOT get a genio unless and until she gets this fixed first? There are several key factors in place here and yes I am very concerned about the advice she got, it's not just about the money or how invasive a jaw surgery can be, but there could be well other underlining issues that could cause problems down the road. If a jaw is misaligned, then there are undue stresses put on it, and it can cause it to deviate further, and by addressing a band-aid genio offset, then you got two problems now. And say she gets this (jaw deformity, if it is that) fixed in the future, then that means the genio will have to be corrected as well. My position is solid on here and will not change due to criticism that you need a correct underling skeletal relationship before going on addressing another issue to cover up for the first.