I believe that James Black also mentioned her being low ranked in Clash or Red and Black as he was explaining things to Conan.
Surely you noticed that the name "WAKASA RUMI" has all of the same letters of "ASAKA RUM" with the addition of a "W" and an "I". Thats the message I was talking about. When the BO noticed that a song with the name "ASACA" spelled that unusual way was to be released, they immediately sent out Bourbon and Vermouth to investigate. Why now would they have one of their own use it in their fake name, especially around Conan? It would seem more likely to me, and to the others who have already mentioned this, that Rumi would most likely be the person who is uploading the case to the internet. Due to the page getting taken down a lot she probably sought out people who have visited the page, using the dying message in her fake name as a way to draw attention to herself and help expose the case to the public and finally get it solved.