"And computer coding," it's a little snarky. Jemma needs to pull herself back from it but she's feeling personally affronted that the Doctor is back. How? Why? These are questions she cannot ask him, but he's the only one who might know.

She'd be more reassured if she had something with which to defend herself.

"None at all. I'd wager you couldn't find the slightest hint something ever happened." If only her mind was equally as unscarred.