Dissociative Identity Disorder is usually caused by some kind of intense trauma. So, it brings up the fearful idea of what Harumi experienced to make her create Maria.
The fact Harumi has zero contact with her family heavily implies that she never told them about Maria, or Maria's selfish personality repelled them.
People who suffer D.I.D. typically have relatives and friends who know their condition; being in contact with them, so they can help.
People who suffer D.I.D. typically have relatives and friends who know their condition; being in contact with them, so they can help.
It's not a good idea for one suffering dissociate identity disorder to forcibly try eliminating their alters. Rather, it's extremely unhealthy as the alter will fight back and try to stay more.