From memory, in the movie doesn't she put belladonna in his tequila to make him go to sleep so she can get away?
That's also the same message I get from the lyrics in Dear California. She slipped him some belladonna (that she crossed town to get), so he wouldn't notice her "grand French exit" (ie. so she could leave unnoticed). I don't think Vanessa's saying she killed him.
Hmm... I think this is too much of a coincidence, and that maybe she is making a reference to the movie.
I hope so, I love the movie
Arwen, you definitely need to watch it!
Sarah xx