Sam was too accustomed to weird and otherworldly things to be totally astounded by his ship-- impressed was probably a better word. It wasn't a concept she was familiar with, but all the same, it was difficult to shock her. Actually, awestruck was probably a good word for it. Not just by the technology, but by... everything else.
"You're still the last of your kind in your timeline," she offered. She suspected that the future version of him bothered him more than he was letting on, or maybe that was just her own projection onto him. It definitely would have bothered her to think that she would die and some other Sam would continue on... even if she were much the same. It disturbed her just to think that might have actually happened. Not to mention the way she kept wondering about her time spent soulless, or what might have happened to her in other universes...
But she wasn't the type to dwell, and neither was the Doctor, it seemed. He went back to working almost immediately, and Sam didn't begrudge him that; his ship was far more important than socializing. Her priorities were in the same order as his.
Cautiously, feeling somewhat self-conscious about it even though the Doctor had given her permission, she touched the console again, and looked at the soft glow at what seemed to be the core of the ship. "Hello," she said, quietly, intended for just the ship to hear. It felt about as weird as talking to the Impala would have, even if the Doctor was carrying on a conversation with the ship and apparently getting a response. "It's nice to meet you, um, TARDIS. You're a lovely ship."
And then, having made herself feel sufficiently awkward, she was happy to be distracted by an instruction to help with whatever the Doctor was doing. She looked around for the instrument he was talking about and located it, but then hesitated before actually using it. How hard was she supposed to hit?
Maybe he didn't realize how hard she was actually capable of hitting anything; most people underestimated her strength when they looked at her. But she had been trained to be able to decapitate creatures with a single swing, and with this mallet she felt she could break the console into pieces if she really tried. Obviously, she didn't want to do that.
She thought about asking, but didn't. Instead, she tried a light hit-- light for her, anyway, it was more than just a tap-- on a part of the console that didn't have anything sticking out of it or attached to it, so as not to risk breaking anything off. Then she looked down at the Doctor to see whether she'd gauged it right. "Did that work?"