I have no idea who you've mistaken for her, but Wikipedia doesn't mention her being involved on How (How (TV series) - Wikipedia, the free encyclopedia. Her first TV appearance was on Countdown in November 1982 - the first programme on Channel 4. She was a junior civil engineer before that.
Well, if it's not on wiki then it can't possibly of happened!
Good luck to her, sounds like a great adventure.
Also, she is definitely mentioned as one of the presenters of how 2, so perhaps you just need to brush up on your reading skills
How 2 - Wikipedia, the free encyclopedia