I think you should text her.. just some light banter.. try make her smile.. nothing too cheesy. She contacted you after 6 months which means she was thinking about you that whole time. Try not seem pushy to hang out or anything, but maybe slip it in there if it comes up.

Thanks for the reply odyn. Lol she just texted me right now saying "hello, are u still alive?" Wtf does that mean, so what do u guys think? Should i just leave it be?

I understand what Chocolate is saying, but the way I see it, there's no need to burn a bridge. However she is definitely "back burner" material. If she is indeed, as Chocolate says, only contacting you because she's being ignored by someone else, then it's reasonable to assume that if things go sour with this other individual, whoever they may be, you may get a nail or two out of it.
Don't invest in this, it's not worth it, but as I say keep her on the back burner and respond any time that she contacts you simply inviting her to come over.

"Hey, you alive?" "You're welcome to come and find out "

Anything like that really, I wouldn't expect anything to happen, but it never hurts to throw an invitation out when they initiate contact.

More importantly. Focus on other people.

It appears that you handled it correctly when she first disappeared, so well done! One of the hardest things in the world to do is to fight that annoying instinct to chase, but the correct response is indeed to not chase, let them go etc.

When a girl disappears like that she's used to having guy's chase her, when you don't chase eventually she will realise that if she doesn't do something about it, she'll never hear from you again and if she's still interested above 50%, she'll reach out and contact you in the manner that you describe here.

You also did the right thing by asking her out when she got in contact with you, but as she declined the offer really the only thing you can do now is wait, during which time you should be attempting to replace her with someone better. If she contacts you again just tell her it's awesome to hear from her and when is she free to hang out, if she declines again just ditch it. Always be polite though.

It's amazing who comes back when you don't chase, just last year I was seeing a girl and things were going great, then out of the blue she attempted to friendzone me... I said no, I'm not interested in that and get in contact with me if you change your mind, then nothing, nothing at all, gone from her life forever. 3 months later guess who comes running back but by that point I didn't really want her anymore anyway as I as into someone else but it just goes to show how not chasing and doing nothing really can have the desired result although it may take time.

Again, well done on not chasing her, she'll probably get in contact with you again, but it's probably worth replacing her anyway, there's a million awesome girls everywhere

Actually today is her birthday, i might just send an happy birthday text just for not being rude. But it seems likens bad idea. On plus side she might want to meet. I just feel like its not polite ignorant her birthday..but considering she havent been polite so..