Thank you.
I don't think you are being a big baby if you stay away. Then again, given this situation, I'd not say it means you are a Warrior if you do attend.
If she's a regular member of this circle of people, then you will need to deal with it in some way. Some, and only some, examples include:
Continued avoidance of places she is likely to appear.
Self-numbing or 'getting over it' unilaterally, so you CAN be in places where she might appear, without you're crumbling or clamming up.
Getting so you CAN go, and be ready to give her brief statement of displeasure if she approaches you.
Getting so you and she can discuss what happened.
By the way ... how old is she and how old are you?