Why is she still bugging me?

ok...here's the situation....there's a girl my buddy dated back in may...she broke up with him after 2 weeks....i posted an ad on craigslist in the personals....a girl responded and what do ya know...it was her....i talked to her for a couple weeks...i then found out who she was when she sent me her picture....WOHA....put on the brakes...i told her i couldnt do that and im no longer interested...she keeps sending text messages and i just igonre em...it's been 3 months so far and every single day she sends me a message...i keep ignoring em...so how do i get her to stop....i made it very clear that im not interested...