Ground Zero

Bullshit. While Miranda undoubtedly has control of some of your systems, if she had complete control, she wouldn't even be giving you a chance for survival with as obsessed as she obviously is. She would've just disconnected your food and water dispenser and taunted you before leaving you to die, or even just waited for you to enter one of your other rooms and then sealed the door to trap you. Actually she would've sealed the door to the computer room if she was so worried about you disconnecting. In any case if you get in that elevator you're most assuredly at her mercy, what's keeping her from stopping the elevator midway through as you're going up?

You're sure if you just go to the computer room, you could disconnect and that would be the end of this.

"Alright Miranda, let me pack some things."
"Yeah yeah, hurry up, the Elevator will be here soon, and you better be finished packing your shit when it…HEY WHERE DO YOU THINK YOU'RE GOING!!!"

You run to the computer room while Miranda shouts more threats at you, and turns the lights off.

"I warned you! Don't you dare try to disconnect, this Shelter will be your fucking tomb! Here's a fucking virus shithead!"

You stumble around in the dark as you rip out all your connection lines again and then forcefully pull out the mainline destroying the attachment. Miranda's voice disappears and you've stopped her.
However you still need to get things back to normal again, so you immediately turn your computer on and start doing a system diagnostic, after all you weren't completely idle during those years of isolation. You read books on electronics in your private library and the Shelter handbook cover to cover, not to mention had lengthily conversations with it about some of its systems (Though you wish you'd paid a little more attention). You begin delving into the inner the workings of the Shelter's controls.

After some scanning, Miranda really fucked up some of your shit. You manage to get the lights on again, but lots of files were corrupted due to her hacking. The AI is damaged, you doubt if it'll be talking to you again anytime soon. You're going to have to spend a lot of time working on things just to get them right again…its funny, but you realize you could finish bringing the elevator down and leave if you wanted to. You don't know why you didn't think to do this before, but then again things were a little different when the Shelter was actually talking to you. It didn't feel right to go hacking into the Shelter while it was attempting to be your friend.