How to protect marriage after accidental physical confrontation and potential divorce?

I got married 7 years ago. In the beginning, we had some fights, and once or twice, I slapped her, but it was just one or two slaps. Recently, we had a small quarrel, and she went to her father's house. The next day, she returned to take her clothes, and I asked her to resolve the matter between us, but she didn't agree. While I was pushing her with my leg, I accidentally hit her face. There was no injury, but now she doesn't want to come back, and I believe her family is planning for a divorce. I want to protect the marriage for the sake of our son and for her too. Can you please provide some suggestions?