From your description, you care about your friendship with that friend. Now that the relationship is tense, you think there is a third party, that is, a villain, who worships you two. It is also possible that you both like one person at the same time or have a competitive relationship with others. You really want her to quit without hurting your friendship.
But in fact, you need to get back to reality. Do you think friendship is more important or what conflicts between you are more important? If you weigh it out, then do the next step.