The actress' name is Michelle Forbes. According to IMDB, she was on Season 2 of "24". I didn't remember what happened to her character, but according to the "24" Episode Guide the last she was seen, she was being put into an ambulance after her fall.
If I may geek out a little bit... I'll always remember that actress for two roles she played: Ensign Ro on Star Trek: TNG and good twin/evil twin Sonni/Solita on "Guiding Light", way back in 1987-89 (her first role, apparently!)
Ensign Ro? I hated that character. She was awful!
OK, Season 2. I wasn't sure. I think I remember her on Star Trek, but haven't seen "Guiding Light" in 26 years. I could probably start watching tomorrow and pick up the story line pretty quickly. ;o)