If you are going to go as her schoolgirl form, you will probably have a very hard time being recognized. She does not get so much screen time and is not one of the best-known characters in the series. Real fans will recognize you straight away if you have done the haircut right. If you are going as her combat version, the odds are a bit better in your favor. Her props are pretty unique but to make sure people know what they are you will need high-quality props that are accurate to the anime.