Indeed. I may have to remember this for the next time someone says America's freedom of speech means people don't go to jail just for posting stuff on the internet.
The difference is she was a mayor of an American city. She was an elected official in direct contact with CCP officials, and while the examples provided are more or less trivial, I would hope that she would be investigated. A US official has access to certain private information and it's not far-fetched to conceive she could be disseminating private information about, at the very least, local politics