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I think then she got a bf and lost interest. 6 months ago I'd tried to make contact again and she ignored
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...feel teasing her about things I know will build intrigue and when I say we spoke before she'll feel good we have a history.
It sounds from your earlier post that it isn't a good history though (unless I've misread your post). I would use the knowledge you have to your advantage and keep it to yourself that you've spoken before.
If for example you can use your previous conversations to second guess her feelings/emotions so that so "feels like you understand her", you're one up. But telling her you've spoke before would be like a magician revealing how its done. All the magic lost.
Good luck, let us know how you get on.