After a quick search on dailymotion for アトミックベティ there was an upload by Ikki abe titled “Atomic Betty Pilot”: www.dailymotion.com/video/xoe1t I’m not sure if this is lost or not but I didn’t encounter it anyone else in my search, so I downloaded it.
I also stumbled upon a Japanese fansite, here’s the page about Atomic Betty, it has episodes summaries and even a list of what episodes are on the two DVD volumes that were released: loucartoon.gozaru.jp/betty/index.html