I work in a very close-knit team. A girl joined in August and took an immediate liking to my close friend. A few months later she admitted to fancying my friend and said she was determined to 'convert' her. Since then, all she has done is undermine me and throw herself at my friend.
Some examples, on a Monday morning she announced my pregnancy to the entire workforce before I had told some key people. Thankfully I had told the boss. The following day, at the restaurant she sat beside me and lit up a cigarette. IN A NO SMOKING restaurant - BESIDE A PREGNANT WOMAN!
Since then, my friend has kind of gone over to the dark side, which is a side issue and very hurtful but what do I do about this nutter!?