Why does she go on to say that some might call her a "Luddite"? This would imply that she doesn't believe in technology, which could logically be extended to perhaps include "understand" technology.
I don't know if we can necessarily draw that conclusion from the limited information in that statement. It would seem almost as if she shuns technology deliberately.
I'd feel pretty comfortable saying that no cabinet-level official really "understands" technology enough to make decisions on cybersecurity. They rely on subordinates who (hopefully) do.