A couple of comments:

1. She is a former member of congress, so as a private citizen she now has the right to say almost anything to almost anyone. Whether you agree with what she is saying or not, it is her right to say it.

2. Fortunately, the "crime" of sedition has been essentially nonexistent since a 1957 court decision, and prior to that it had not really been used for about 50 years.

3. The US could use a lot more "sedition."