Honestly, OP, listen to Wings.
It's very easy for people on here to encourage you to feed the drama. They enjoy the spectacle and don't have to live your life.
Look, you don't have to answer her calls, or have lunch with her, or anything but your whole friendship group sounds ridiculously dramatic and it's 99% unnecessary.
When you're returning her texts, you could easily say "Honestly, it's sorted. We don't need to discuss it. I have no problem with you so let's draw a line." or whatever.
The abrupt answers and continuing to discuss it with everyone else is just prolonging it and making it a mountain.
And don't forget, these friends with whom you've been discussing it have been talking to her about it, too. If they talk to you, they'll talk about you. So be careful.