Fair concern to have, but isn't into possible that, just as the supernatural elements of the original series (and FWWM moreso) served and enhanced the realness of the trauma of incest and child abuse, the Diane tulpa is a supernatural representation of how sexual assault leaves behind a damaged victim, a shell of ones pre assault self.
On a wildly different note, I got a satisfying laugh out of Bushnell saying he had the Mitchems on "speed dial."