I think I really need to ask my friend to stop sharing one of her favorite stories all the time.
Why do you want to ask a friend to stop sharing one of her favorite stories?
She always talks about it when someone else joins us for a drink and I get bored.
While I understand that you have heard the story before, it's important to consider that others have not. Try to consider how you would feel if someone wanted you to stop talking about something that you are passionate about.
I didn't say I was gonna force her to stop. I'm going to tell her how much I dislike hearing the story over and over. Maybe she'll stop on her own then.
It's important to consider how your opinion might make your friend feel. Telling her how much you dislike hearing the story might cause conflict between you both because it could hurt her feelings.