First, if she cliced on the pillcrow (paragraph mark) on the formatting toolbar, that will display them. This is a toggle. Clicking it again will hide them.

There is a keyboard shortcut for toggling display using Ctrl+Shift+8 or Ctrl+*. These are not the keys in the numeric keypad but the regular typing keyboard. This shortcut works in Word 97-Word 2013 (and probably earlier and later versions as well).

For more, see Showing non-printing formatting marks in Microsoft Word.