You were warned off her, she has a track record of being a bitch, she is trying to "subtly" undermine you with her barbed comments and efforts to make you feel insecure.
I would take a big step back from her - be "civil but distant" and talk only about work stuff. Don't make yourself vulnerable to her.
People like this also thrive on secrecy/"divide and conquer" tactics. If I were you I would mention what she said to you to the techs, and also mention to her that you mentioned what she said to the techs. Not in a serious/ "I'm so devastated by what she said, is it true?" type way, but in a humorous, "I've let them know that you've put me on to their game" (to her), and "I've been told by X that there's a running bet on who here can talk to me the longest, I find it VERY hard to believe - although I can understand why you'd all want to talk to me for as long as possible due to my incredible personality - but if it's true I'm on to you, hahaha" (to them) type way. (I'm Australian too, presumably like Aussiebean above, so this may be a culturally OK solution to me but seem weird to you, who knows, but I think it's a good idea.) By doing that you've told her:
- That she doesn't have the power to make you insecure.
- That you won't keep her dumb manipulation tactics secret.
- That if she actually maliciously lied, the techs now know, which will lower HER reputation in the office.
And you're also giving the techs the opportunity to open their eyes to her underhanded ways (if she told the truth, they know she can't be trusted and is trying to create divisions; if she lied, there's further evidence that she's manipulative and untrustworthy).
Ultimately, though, even if she told you some form of the truth, I would not take it personally or think it means the techs hate you or you are the butt of their jokes. They are probably just bored/have too much time on their hands and view you as enough of a friend that they can all feel comfortable talking to you and involving you in their "jokes". Some people are just stupid like this. As a student I once learnt that some students were playing a stupid game during a live examination regarding an examiner's penis size, based on the size of his hands. They still liked him - in fact admired him incredibly - but are just immature like that. To me - incredibly disrespectful, lowered my opinion of those students considerably. To them - "just a laugh".
In the office, I try to live by the motto, "Don't let the bastards get you down". Because there are a lot of "bastards", and by definition, they do strive to "get you down". Don't let them have power over you, save your energies for the people worth respecting and investing in.