1, you are too direct and purposeful. Friends are actually a very delicate relationship. You don't need to be specific. You talk a lot, get familiar with it, and naturally become friends. And you suddenly say that you want to make friends, which makes people think that you are here to chat and make friends, so girls are hesitant to continue chatting with you.
2. You seriously say that you want to make a friend, which will make girls feel at a loss. I don't know if the friend you are talking about is an ordinary friend or a boyfriend and girlfriend, so the girl's answer is to agree or disagree, or how to clarify the relationship with you.
3. The girl didn't directly answer the question of making friends, but just said a quantity, which means that she may not want to be friends with you, but she doesn't want to hurt you directly, so she is hesitating how to answer you.
Most people don't reply to your questions directly on WeChat. Maybe she doesn't agree with your point of view, or she is hesitant about how to answer you.