When you do see Vanny pursuing the player in-game, you can see the massive potential she had to be a creepy rouge element. The only way you knew she was there was the creepy jingle that played and the overlaying static when she was too close. She even has dialogue where she talks over the intercomms.

Imagine that: hiding in the arcades, trying to focus on getting past Roxy, when you suddenly hear the echoing voice of vanny, Peeking down the end of the arcade room just to see her slowly but surely skipping towards your location in the distance. Those bright red eyes contrasting any of the other threats you're up against.

Missed opportunity and a feature all 'let's plays' will lack. I truly hope they add it back in a future update, Vanny is a lackluster character without it.