Unless it was a mistake, a character named "Abby" was at one point identified as being in that shower scene, but April was the one speaking when the name appeared. Not sure if that is true for this version yet, I started a new playthrough, and there is a ton of content to enjoy (other than the new stuff, the only scene I haven't seen is Ada's second hallway encounter, as I had finished Maxine's arc prior to it being introduced last time). Don't know if that will be her, but ya never know.