Today I took a photo of a girl I like, and she said I didn’t dare to post it to her. Should I post it or not? The relationship with her is not clear yet

There are two possibilities for this woman. One is that she also likes you and wants you to say that you are hers. The other is that she means to show off. You post it and others ask her. You can accept or reject. It seems that it is not clear yet. The latter possibility is more likely. It is better to make it clear to her and confirm the relationship before sending it. If she rejects it, your girlfriend will definitely not be happy in the future.