People, at the end of the day and the end of their lives never regret what they do, but are filled with regret for what they didn't do. Write down what you want to say to her and then take it with you. When you open your mouth, and if the words won't come out, tell her you want to read her something. Always be prepared. And you might want to bring her one flower.
Women love flowers.
And don't make any assumptions about what she will or won't say. Remember, she is first your friend. So talk to her as your friend - with honesty and authenticity. And don't be afraid of ruining the friendship. True and real friendships can and do endure hardships and obstacles.