Probably because Claudia Farrow didn't raise Rose and her sister. They were either taken from her or she gave up custody to her sister, who raised them. Mr Farrow is NOT Rose's Father either, Claudia married him and moved to Weleetka after she lost custody of her daughters. The people in Weleetka didn't even know Claudia HAD a daughter until Rose and her husband moved to Weleetka 3 years ago. The relationship has been, and still is somewhat "strained" and the Farrows were not as close to Skyla as they insinuated they were...when Claudia was being interviewed all the time Rose's words were, "she barely knows my daughter".
Obviously Rose is a very private person, she is not appearing AT ALL on TV or being interviewed in the media (she says her husband is speaking for the family when necessary) and friends say she is having a very difficult time after losing Skyla this way. She is not (understandably) real close to Claudia and Jimmy Farrow and probably feels somewhat isolated and even paranoid in her grief. The Plackers have moved, but the Whitakers are staying. I think that's one of the reasons she has decided to go to work at Skyla's school - plus I believe her younger daughter starts school there this year.
Like most families, this one isn't perfect - Claudia is Skyla's GMa, but that doesn't mean she is particlarly "close" to any of the family. And I hasten to add that Claudia was at the scene and could easily have been there during the initial interviews and also could have been told what Skyla's injuries were by several people. I just do not believe CSI/LE would allow Claudia near the body - this is most obviously a homicide, they obviously hoped to have some DNA and other evidence on the bodies and would not want it touched or contaminated by a bunch of people leaning over or touching the body. Claudia said Skyla was shot execution style under the chin - she was actually shot in the neck where it met the chest and in the side of her jaw - neither of those is an execution type shot under the chin - it sounds to me like Claudia was relating what she had been told by Peter Placker, who did see the bodies, albeit when he was very upset.To Peter it might have LOOKED like both girls were shot execution style, it was a very bloody and ugly scene Peter walked up on - so SHOCKING!
Again, it doesn't matter and if people in Weleetka feel Claudia exaggerates and embellishes - that is their opinion and they have their reasons for believing it. THEIR OPINIONS, just like ours here.
And that's MY OPINION