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People may notice that you two aren't friends anymore and ask you what went down. It's okay to say something non-specific, like "we just kind of drifted apart," but don't get into the details. Talking trash about your former friend is mean and immature, no matter what happened to cause the friendship to fall apart. If your friend gets nasty, spreading rumors or gossiping about you on social media, try not to engage. There's no point in dragging things out or defending yourself to someone you don't even want to be friends with anymore. But most importantly don't do the same to her. If you talk behind somebodies back, word will most definitely come out. If anything, it shows that you made the right decision. Things might be awkward for a while, and your friend may be angry or hurt, but treat her with kindness and respect. Remember that this is someone who was once your friendmaybe even your best friendso honor what you had. Don't do the look-of-death thing or straight-up ignore her. Just give her a small smile or nod of acknowledgment and move along. If she talks to you, turn it into a friendly conversation that won't lead into getting closer. Try to keep talks short until she feels as if you don't seem interesting. Ending one friendship may cause ripples if you're part of the same group. Mutual friends may take sides, ask you to reconcile with her, or even get angry. Try not to get upset if some of your mutual friends feel they need to take sides. This may happen, and it's going to hurt, but those people are petty and looking for drama, and you don't need them in your life.
Don't gossip if people ask you what happened. Be polite when you see her. Don't get drawn into any drama if your mutual friends get upset.