Sprague Grayden was 31 in Paranormal Activity 4 when she played the character 'Kristi (archive footage) (uncredited)'.
That was over 12 years ago in 2012.
Today she is 43, and has starred in 11 movies in total, 3 of those since Paranormal Activity 4 was released.
In Paranormal Activity 4, I think Sprague Grayden looks: