I think it's time we put to rest any speculation about whether Gannon got out of that truck at 2:19 on Monday, Jan 27. He did not get out. There's a camera right across the street, there are many cameras. LE has done their work.
Then, we have her own admission that she drove all around northern CS that day (no one else was driving the truck), that she "got lost" near a particular exit (that LE already knew she'd used), and they know she drove around, and have records of her various stops or slow-downs (probably from more than one source).
She's the last person to see him, she loaded him into a vehicle, she returned without him. She has lied about the circumstances and is not cooperating with LE. She now needs to explain the blood in the house to LE, not to the media. She needs to explain many other things as well (any other body fluids, what she put into the truck that day, whether that's really a shovel she put into the truck on Sunday night, etc. etc)
She will now do this through her attorneys, but of course, the Prosecution does expect answers in some form. Pleading the 5th on every question is not a good look for a suspect, now is it?