School mum invited me and another school mum out for an evening drink/meal in a shared chat between the three of us. We have met up once before as a 3-some. We all agree to it and decide when and where etc. And then only after this, the first school mum says is it ok if we invite some other school mums to come along too! I'm a bit miffed as I prefer smaller groups and was hoping to get to know these 2 mums better. A larger group just wouldn't be the same and makes me feel a bit socially anxious. Am IBU to feel a bit miffed and disappointed ?