The new tunnel you took was one that took quite the winding path upwards, going through what felt like several stories' worth of travel at your scale. Eventually, though, you found yourself up at the very top of her head, inside of Barbra's brain. It... didn't look quite like a typical brain, for some reason. At the front of the room were a pair of windows, her eyes, letting in light as she did more of her posing routine. To either side were smaller tunnels, which likely just lead to her ears. All around the place was various workout gear, no doubt a result of her commitment to fitness. And in the middle, was what looked to be a state-of-the-art computer.
You walked over to it, pushing a button to put it out of sleep mode, and finding a password screen. While it perplexed you, you eventually found the password itself on a sticky note attached to the underside of the computer desk, inputting it and giving you access to the desktop. Seems like this computer not only lets you access all sorts of info on Barbra, like her personality and memories... it also gives you programs to both modify and control her body. Very intriguing! Perhaps you'll be able to turn this amazonian babe into the best gal to live in with a little bit of fiddling. Now, what should you try to do on this computer...?