Did she ever do commercials?
When I first watched Close to Home, Jennifer looked familiar, but I couldn't remember where I'd seen her. So I went to IMDB and looked at her past items, but I've never seen any of those TV shows on a regular basis.
I've only been able to come up with two explanations: Either (A) she reminds me of someone else (not Heche, Krakowski, Headly, or Hannigan, as mentioned in other threads), or (B) - I remember her from commercials.