Can she be fired??

My husband is in a position at work where sometimes he has to communicate with all the employees. They have a new one of a few weeks. She constantly tries to speak to him all through the day and then later in evenings as well. It is really weird. It kind of scares me. He told her to please utilize work communication and not his personal phone number. Since work communications are monitored he feels that’s always best and I don’t blame him. Well she won’t stop. And yep she’s married! He had to even block her from everything, and she is STILL trying. What in the world? Can she be fired for this? The main boss is his best friend so I’m sure he wouldn’t want dummies trying to cause issues between his best friends marriage AND not being professional! It is driving me insane to the point I want to roll up and go full on Madea on this crazy!!! He doesn’t want me to say anything of course because of his work but come on!