She did good
Not sure if it is brandishing but it seems rather threatening. Not sure what I would have done about it unless I had seen him do it for myself. If I felt threatened enough I might have mentioned to the store manager what happened and let that individual deal with it. Don't know intent of his action or if she read it more threatening than it was intended. None the less it seems like a very irresponsible move. I think she made a good choice and avoided any further contact with this man.
The strongest reason for the people to retain the right to bear arms is, as a last resort, to protect themselves against tyranny in government. -Thomas Jefferson