My girlfriend and I are angry because we can't meet. What text message should I send to beg her to forgive me and make up?

She is angry with you because she really wants to see you and cares about you.

So you need to explain why you can't see her. As long as you make it clear sincerely and truly, she knows that you have a reason, and you are not avoiding her subjectively. You really need to see her objectively. If she is reasonable, she can forgive you.

Be polite, apologize to her for this, and then coax her, saying how to think about her, how to look at her, how to care about her … and so on. In short, make her happy and she won't be angry. Don't you think so?