What should I do? Friend problem?

Next year I'm planning on doing both track and speech, which is a lot to take on. I was excited to do both, but I recently found out that someone who is not my friend anymore had decided to do it too. She's friends with a lot of my friends, and also a lot better at running than me. I wanted to do it because it challenged me, and I had a lot of fun hanging out with my friends when I did it before (without her). I can safely assume that if I do it this year I'll have a lot less fun time and more tense silences/her being snobby/her hogging my friends. I'd love to do it because my besties want me too and I liked it a lot before, but since I'm not a very good runner anyways and she's going to be there, I don't know if it'll be worth my time/energy. Should i do it anyways or stick to speech?