I'm gunna be difficult and instead of saying ignore her, I'm going to suggest you talk to her. I would normally say ignore her (I ignored this guy who stalked me and he left me alone) but as she's been doing it for 6 months, it doesn't look like she's going to give up! In her mind, the more you leave her alone, the more interesting a person you become to her. Instead, why don't you try to get to know her? Maybe she just wants to be friends? Once she gets to know you a bit, she might leave you alone. Good luck!