Correct use of the word 'nevertheless'

Hi all!
While I was texting with a friend of mine, she said the following:
"We'll talk about this later tonight!"
Half an hour later, she replied:
"Nevertheless, we'll talk tomorrow."
And so I, being the great friend I am, told her her use of the word 'nevertheless' was incorrect. She stubbornly kept believing her use of the word was correct, so I bet her €1,-.

It would be much appreciated if someone could help clarify this situation HELP ME WIN A EURO! WOO-HOO!

EDIT: I should add this:
She wanted to use 'nevertheless' to contradict what she said before (so instead of talking tonight, she wanted to talk tomorrow)