So, after freeing Poppy from her case, you went to the Maintenance Closet behind Elliot Ludwig's office to turn on the power for a specific door to the left of Ludwig's Office. While doing so, you hear a box being pushed and drop to the floor, you immediately look to where the noise came from and saw Poppy on one of the pipes looking down at you, seems like she pushed the box away from the ventilation system.

Poppy: "Oh! Uh, sorry, I didn't mean to scare you. I was just... trying to get the power back on! Here."

She then moves away from the second power source. You then loop your GrabPack wire around the higher power pole first before wrapping around the lower pole, then you complete the circuit.

Poppy: Claps her hands "Hmm! Um... I wanted to thank you for freeing me, I was stuck in there for so long. Thank you. I'd like to pay you back! There is a train station nearby. It needs a code, and I have it. We're going to get out of here."

Poppy then can be seen enter the vent she come from and then can be seen on the side of the vent taken to enter Maintenance Closet

Poppy: "As soon as you get up on here! Hmph!" She says as she waits for you to enter the vent with her "Come on... While I'm still a doll! Hmhm!" She waits more, and you still don't go in the vent, probably because you don't trust her after Huggy Wuggy chased you in the vents and you believe she's trying to manipulate you. "Uhh... Don't you want to come with me? You're making me sad..."