A stalker girl is really creeping me out, please help?

[Mason :)]

There's this girl at my school who is getting out of control. You don't have to read this all, it's going to be a rant. Long story: It started with putting really over-the-top love letters in my locker, that were asking me to go out with her. I wrote her back telling her I really wasn't up for dating because my former girlfriend had just cheated on me. She said ok, asked for my number and I gave it to her. Then she'd text and call me ALL THE TIME. At least 2 calls a day and 30 a day when I don't respond to them, and when I do respond...at least 80. Then she started randomly showing up at my house quite often! She'd just ring the doorbell and asked if I could hang out. She honestly was there just about every day. One day I got out of the toilet and she was there, right in front of the door, and started talking to me. She seems to seize every opportunity to talk to me or sit next to me. She started commenting things on my twitter that I tweeted forever ago. My friends all started called her "Psycho Anna". One day, I got back from my friend's house, it was about 9pm, and I looked out my window and she was down on the street waving at me! Another time, we were at a frozen yoghurt place, and she happened to be there...she sat across from me and told me she really liked me, and I said, "I really don't get why, I don't even think I'm that attractive", and she honestly picked up one of those metal napkin boxes and threw it to the side where it hit a man. Pretty embarrassing. Now, somehow she's figured out who I fancy, and she's been sending her death threats! The girl that I fancy is one of my best friends, so we sort of joke about it, but she does sometimes get really scared about it, and hurt by the bullying that Anna has given her. I'm also worried that she may have figured out I fancy her since Anna has been sending her death threats, and I don't want it to be awkward, she's really one of my closest friends and I don't want to end that. Anna got so intrusive that it now is starting to annoy my mum, to the point where she actually called Anna's mum, but Anna's mum honestly replied with, "Oh, let her be, she's just a girl with a big crush". She's getting worse and worse yet, and I've actually recently told her I was gay so that she'd leave me alone, but that didn't stop her. Anna is a pretty girl, and I'd definitely date her if she wasn't this weird, but unfortunately, she is.

Sorry about the incredibly long rant. Again, I don't expect you to read all of that haha. But any advice on how to control a majourly stalkerish girl under control (and fix things up with MY crush, if you read to that part haha) would be greatly appreciated
Forgot to put some things: everyone says she's completely normal and actually really nice, funny and cool except for when she's around me. I also really don't want to hurt her feelings. And I'd rather not get the police involved, but if that's really what I have to do, then...maybe.

[poggle]

You and your friend should take the texts to the police, report it and say you need help as its got out of hand. That will at least get things on record. They'll have a chat with her. You could both end up with an injunction against her.
Then block her number and avoid all contact with her as much as you can. The only way to deal with a real stalker is to make them go cold turkey. Eventually they'll fixate on someone else.

[Abe]

Oops wrong question EXCUSE ME. But the answer from poggle is correct

[dan]

Tell her that her behaviour is starting to scare you and that if she doesn't stop then you will call the police. Don't be too harsh but be firm. Tell her what you told us about her being attractive but then say that her behaviour is putting you off. Tell her the complete truth, tell her why you told her you were gay and that if her behaviour continues then you will go to the police and she may get a criminal record.
Tell your mum again the situation. I know she has been downplaying it but you've just got to be persistent with her.
In terms of your crush, you've just got to sort this out with your stalker first. Tell her about your disapproval of the death threats and just get the situation sorted first. With your crush I would just try to separate it from this problem and hopefully the situations won't interact with each other.

P.S. Try and tell your stalker the problem as nicely as possible as she sounds like a bit of a psycho and could flip out. Deliver the news like a sandwich. Also, consider getting your school involved.