humanclock beat me to it. This has been refuted several times. Though I'm sure the situation she describes was a dangerous one, it's unlikely it was Ted Bundy.
My ma was picked up Bundy too while she was hitchhiking in the 70s. She described him as some weirdo in a Slugbug with a Washington license plate, and an arm cast. She believes nothing happened because she was with a friend. She recognized him later the same way as Debbie Harry.
If everyone who claims to have been picked up by Ted Bundy had actually been, they never would have caught him. Because it would mean he had super powers and could bend space and time.
http://www.snopes.com/music/artists/debhar…
Blondie were still trying to make it, when Bundy was on the prowl. At that point Debbie was probably still an unknown.