How to say sorry to a girl.?

[Been There]

How do you say you are sorry?
With actions.
Words are cheap and often dishonest .. but actions are honest.

If you are sorry, then you will respect her wishes and not talk with her. It really IS that simple.

She has told you she doesn't want to talk. Nor normally, and not any other way.
You either respect her wishes or you don't.
Do NOT send her a text. Pay attention. No, no, no texting.
The door has been closed, and locked. Do not stand there and pound on it, hollering for her to open it. You only look selfish, disrespectful, and foolish if you do so.