well, couple things, first id straight blow her off, your better than she is anyway. i always like smart alec comments, with people like that. but dont let her play the bipolor card with you, thats not right.how does she know your bipolor?
one time i had this lady at work that would call me 'death' because i always wore black. so, loudly she and her little group of girls walk in and she says ' oh look, deaths here.' so i leaned over to her real quiet and said ' call me that again, ill show you the meaning of the word'..it wasnt a threat, but it shut her up.she didnt call me that again..yay!
you got to blow people like that off, they dont exist, so dont even grant them your time.