Having A Bit of Girl Trouble?

No, don't give up yet. Walk over to her and ask her whether you are still on for the formal and her answer will tell you what action to take. Maybe she means nothing not keeping up with what YOU think matters so much (a convo). Ever thought that it might not be so, so, so important to HER to keep up a text convo and might prefer you initiate a human face to face conversation with her more often?