She didn't use the word 'discreet', she used the word 'discretely', which was spelled entirely correctly.
Honestly, why would you make a comment like that? What are your motivations?
'Discreetly' was the spelling she was after.
For you, two pieces of advice:
a) get a dictionary.
b) get familiar with AW, where the confusion between 'discreet' and 'discrete' has become a byword and an in-joke.