Shitty way to lose a friend BUT....obviously they were not worth it in the first place if they attempt to bend u over !
How can the relationship stay in business if she is a bad payer.
Better be a friend than a client.
The best way to lose a friend is either sell to them or buy from them, or even hire them for some job.
Then she's probably not worth keeping either.
Business will ruin your friendship, if you are doing business with your friends.
Good riddance. You should never mix business with friendship.