Showgirls are a variety of silkie, not a separate breed, and are not recognised by either the ABA or APA, which is why they are entered as AOV.
They are many generations into development, and there are quite a few breeders working on them. However, there is not a consensus on whether to breed for or against the "bow tie." Until there is a consensus on the breed standard, there is little liklihood of recognition.
Different judges do things differently when confronted with a situation like you mentioned. Some will, as happened to you. ignore the incorrectly marked entry (personally I think this is very WRONG--you paid the entry fee--your bird should be judged). Others will judge the bird according to the cage tag, regardless of what is in the cage--needless to say the birds will not do well--an extreme example is judging a mille fleur d'uccle in a cage taged as housing a large fowl black sumatra. And the third, and I believe the proper way of handling it, is when a jedge re-marks the tag with what it IS and judges it accordingly. At larger shows this could prove too time consuming, which is, I believe, why it is done less frequently.