It is normal for lovers to quarrel. Only quarrels can make each other understand each other better. It is also because of this that they will care about each other more. However, since it is your fault, apologize well. Here are some ideas for you:
First, bring a bouquet of roses and a letter, write your apology, and give it to her seriously. Maybe she will be angry, and this way of apology will gradually calm her down.
Second, give her a creative little gift. A crystal music box is very good. Clean crystal and good music will make her slowly get rid of her anger. You can also give her a real doll. Her cute appearance will make the original doll laugh happily, and she will naturally forget that you made her angry. You can also give her a teddy bear, which she will definitely like very much.
Third, a sincere hug. Girls are actually very simple sometimes. They just want you to care about her. A hug will let her quarrel for a while, and she will lie in your arms at ease.