This article explains how to know if you have been blocked by one of your WeChat contacts.
Steps

Step 1. Open WeChat
The icon looks like two white speech bubbles on a green background. It is usually found on the home screen (iPhone / iPad) or in the app drawer (Android).
If you are not already logged in, do so now

Step 2. Tap Contacts
It's the second icon at the bottom of the screen.

Step 3. Tap a contact's name to open their profile

Step 4. Tap Messages to open a conversation with this person

Step 5. Send her a message
Type the message you want in the appropriate area at the bottom of the screen, then tap "Send" (this key is usually represented by a curved arrow).
- If you have been blocked, a red exclamation point will appear next to the message, accompanied by: "The message was sent, but the recipient refused it".
- If you've been blocked, you can still comment on their Moments, but they won't appear in your feed.