Free Company's

[Neuflune]

Changing FC's is not unavoidable, I always chose the clan carefully before joining and chat with the leader about their goals and unless things become really, really bad I will always stick with my choice, because a person that changes clans at an alarming rate cannot be trusted.

I think in that case, you can "blacklist" her from your FC and tell your friends too just to give them a heads-up.

Notably, members do not have any power in an FC unless you give them rank privileges so aside from wasted time, there's usually no harm done. As FC leaders (I am one too), we should be aware of the people that we let into the FC. That said, I don't like FC hoppers but also as I've said before (in my example above), members are in a more fragile situation when joining an FC because the FC leaders can control their privileges in an FC or even kick them out without any valid reason.

Edit:

This isn't to say that your situation should not be addressed, or that it isn't frustrating. I think the FC environment should be improved overall to encourage people to play together.