Due to a certain series of events, this character has been split in two. These two halves can be found under Maho_Igarashi and Koharu_Igarashi.
That being said, she technically still exists. …however, you would need the two to fuse. In that state, she is known as Mieko Igarashi. Take the personalities of the two, smash them together, and amplify their power even more, then you have her.