My daughter made a new friend at school, and we bumped into her with her mum at a local farmshop this morning. My daughter asked me loudly to get this other mums number so we could arrange a play, so I have messaged her. She has replied suggesting her daughter comes over after school one day by herself. I feel unsure about having her over without the mum - I don't know the girl at all! And am also really surprised she would be happy to send her girl here without knowing us at all! Is this normal? Am I being the weird one? What would you do?