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, happy that you did it "Hmm! Um... I wanted to thank you for freeing me, I was stuck in that case for so long..." She said as she falls silent after mentioning the case... remembering how The Prototype put her in there and the screams and cries she made as he did so... she didn't like thinking about it. "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 in a smaller vent beside of the vent you taken to enter the Maintenance Closet, which was also connected to Elliot Ludwig's office

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. Poppy notices the distrust in your eyes and it saddens her "Uhh... Don't you want to come with me? You're making me sad..." She said, literally sounding sad as she said, she needs you to save the orphans down in the labs (Deepest level of the factory) from The Prototype