And you know that with certainty? The correspondence would be addressed to her directly since that is the professional thing to do, and not just hand her a memo. But that doesn't preclude a similar letter going out to other individuals who might be speaking.
Even if there was some sinister plot, Ann chose to accept the speaking position. She can certainly make up her own mind and fight her own battles in a foreign country.
I still think there are much bigger fish to fry within the U.S. than worrying about some university outside of our own borders.
Is it really believable that all foreign speakers receive such a letter or just Ann?
Pushing back against anti-conservative bias is a good thing and doesn't take much time to write a comment or call an office to express your opposition to “hate” crimes against conservatives. . .no matter where it comes from, especially when an American conservative is attacked.