Along with her writing partner and husband Mark Ellis, Morgenstern created Flashpoint, a Canadian TV police drama which premiered July 2008 on CTV and CBS, and ran for five years before the show ended by creative choice in 2013. The show was awarded the Academy Board of Directors Tribute for Outstanding and Enduring Contribution to Canadian Television, in addition to a Canadian Screen Award (2009) and Gemini Award (2013) for Best Dramatic Series. She and Mark Ellis are now in development with two new television dramas.
Morgenstern has been twice nominated for Genie (Canadian Academy) Awards for directing the short film Remembrance, which she also co-wrote and co-starred in with her husband Mark Ellis, and co-directing (with her brother Mark Morgenstern) the short film Curtains, which she also wrote and played the lead in.
Morgenstern is also widely recognized by anime fans as the original voice of Sailor Venus in the DiC Entertainment English dub of Sailor Moon in the first two seasons as well as the movies, and provides the voice for Yin in the Disney cartoon Yin Yang Yo!