Wow, blaming the user? That's low. Just like in customer service where the customer is always right, in web development the user is always right. It's not the users fault they didn't see some text, it's YOUR fault.
If you wanted the user to be able to see the message or cared that they did, you would have made it more obvious what was going on here.
That said, she now knows that people aren't reading the instructions and should find someone to get them to.