A live-action show about kids fighting online monsters made real, the episode "Dark Marts" has the female protagonist (actress Aimee Cararreo, born 1986) getting hit with a rogue laser and process-shrinking to roughly doll size, complete with squeaky voice. The whole thing, including her process-growth back to normal is all of about 5 seconds.
http://www.free-tv-video-online.me/p...=1imsikjnij7b7
Starts at 17:12, then again at 18:15.
The link works, but it's spam-heavy so be advised.