Headcanon that Daycare Attendant used to be the Afton kids’ babysitter as well as a circus preformer but was put in storage after the Bite of ‘83 and/or was damaged after Fall Fest of ‘83 and then put in storage.
Then it was delivered to the Pizzaplex and, Glitchtrap not having all of William’s memories, only remembered it being a babysitter and told Vanessa to just put it in charge of the daycare.