Hi, I am a bit shocked as I have received a text from a mother saying her daughter has been upset by my daughter this week and so she'd rather she doesn't come to her daughter's party tomorrow. She doesn't know exactly what happened but doesn't want her daughter upset at her party. I will ask my daughter what happened in the morning but I am feeling dreadful. It's going to be so awkward at pre school for the rest of the term. How should I handle this?