The best advice I can give you is to try and contact a behaviorist. Aggression is not something you want to deal with on your own.
We cannot determine if it is true aggressioin or not without being able to see her.

Until you find a behaviorist you can try desensitizing her. If your friend comes over have him completely ignore her. Every now and then he can toss a really yummy treat in her direction. You don't want him to try and interact with her though. You just want her to learn that men = treats.

Again this would work better if you were working with someone who could guide you and watch her responses.

Good luck I hope everything works out okay.