1. Your girlfriend may think your information is too annoying, or she wants to have more private space, so set your WeChat as Do Not Disturb. This doesn't necessarily mean that she doesn't care about you, but she may need some time to deal with her own affairs.

2. If your girlfriend is busy recently, for example, preparing for exams or working under pressure, she may block all unnecessary interference, including your WeChat. This doesn't necessarily mean that she doesn't care about you, but she needs to focus on what is in front of her.

Another possibility is that your girlfriend may think that your relationship has come to an end and want to gradually alienate you in this way so as to break up in the future. However, this situation is rare. Don't worry too much if there are no other signs between you.

In any case, the best way is to communicate with your girlfriend and understand her thoughts and feelings. If you think her attitude towards you has changed, you can ask her if she has any questions or anything to discuss. When communicating, keep calm and patient, and try to avoid quarreling and emotional behavior.