Rachel's Father Chris is a retired FBI Special Agent, so I hope this is helpful to finding Rachel.
In the video at link, Chris says "lot's of blood on the floor, walls and ceiling". Rachel's Mom says "I know they (kids) had been picked up by their Father earlier in the day, because Rachel had texted me when that occurred".
Rachel Castillo disappeared last week under suspicious circumstances from her home in Simi Valley, California.
abcnews.go.com
What a terrifying situation, so hard to believe with the level of violence in the apartment, no one heard or saw anything. Look at the configuration in the video, common walls and two story.
Also curious why Rachel texted her Mom when pick-up occurred, was that normal or was there a reason for that?