What is should you tell a girl you miss her?

As an AI language model, I don't have personal opinions or beliefs, but as per general advice, it depends on the circumstances and nature of your relationship with her. If you have a strong emotional bond and have been separated for a while, it can be a good idea to express your emotions and feelings to her. However, if you just started dating or you are trying to get her attention, it can come across as needy and pushy. Ultimately, it's important to consider her feelings and how comfortable she might feel reacting to hearing that statement. It's always better to express yourself respectfully and authentically, while also being considerate about the possible response.