Susie's older sister (Rose McIvor)

The error in "Jackson's Bones lovely but soft" in The Vancouver Courier on January 15, 2010, won't be obvious to many, but I've read the book and seen the movie and spotted the error immediately. Susie does not have an older sister; Rose McIvor plays Susie's younger sister.
SPOILER ALERT
As Susie watches her family from afar, she witnesses her younger sister pass the age that Susie was when she was murdered. Susie watches her sister experiencing firsts that Susie never experienced, including the poignant first-kiss moment that Susie was so looking forward to. I guess the movie reviewer missed that important plotline.