So, I should not worry too much and I usually do trust my instincts.
Anna was playing with a little girl yesterday and asked me repeatedly about going to her house. I don't know anything about her but I have a rough idea of who her mom is. So, I was considering it.
Then, I was picking the girls up for school today and I saw her mom - completely unsteady and looking a bit delirious. I've seen her before at school and she usually seems fine. I asked another mom what she thought and she said the mom looked completely drunk. As I watched she nearly fell over twice while waiting to pick up her daughter from school. She was unable to walk even nearly straight as they headed towards their car. (!!)
So - I'm sticking with my instincts and I'm grateful that God provided me with a clear answer on this one. And I'm praying for her now. You never know what people are struggling with in their day to day lives.