She said, "No, wherever you said capitals I put capitals. But in the case of 'space,' you didn't say what to capitalize, so I typed in 'space' with both types of letters. But the computer still doesn't start!"
Fortunately, there is less of a need to spell out commands over the phone in this era of remote access. But in the rare situations when I have to do it, I make it crystal clear that by "space," I mean the long key at the bottom of the keyboard, while Enter is also a key, not a word.
It's better to have a good laugh over the phone than to have something break, because you never know what can happen when untrained people with a lot of creativity have temporary root access to their machine.