Marie Yovanovitch was being watched
[...]
House Democrats on Friday evening released a new batch of messages from Parnas that added to the questions about the ambassador's security. In them, an unidentified individual with a Belgian [!] country code appears to describe Yovanovitch's movements.

"Nothing has changed she is still not moving checked today again," the individual wrote in one message, later adding, "it's confirmed we have a person inside." In another message the person wrote, "She had visitors."