Turned on by the color orange, female lead character

[stillinmyheart]

Female lead Character uses a machine to go "mind to mind"with other people. Tries to solve a murder. I remember at one point she gets a "pearl necklace" which means she can see each moment of her life as a separate event. Also, she gets her personality tweeked and ends up being turned on by the color orange. I read this book in 1994, no idea of publishing date, it was paperback. Thanks! I would really like to read it again.