Spencer Reid's younger sister

What no one knows about the youngest and most intelligent profiler within the BAU is that he has a 20 year old sister. Said sister was raised by Spencer since their mother wasn't able to do it herself.
So ever since Sophie's birth, she was in her brothers hands. And let me tell you, Spencer did his absolute best to be the best big brother that he could. Which paid off immensely since Sophie grew up into a very intelligent and loving young woman, that has become a star in Hollywood. Even though the two siblings live now in different cities, they still are very tight knitted and care immensely for each other.

So what will happen when the BAU gets asked to help the LAPD? And even more important, what will happen if the new case includes no other than Sophie?