The fact that GP calls her mom/parents DURING the time she's sitting in the squad car, while they are both being questioned by police, tells me she will reach out to them during a very stressful, even dangerous time in her life. This also leads me to believe, if she could, she would have called them when she was permanently separated from her van, her life line, on the road.
This young woman is not going to be stranded and not call home or find a way to. Her dad had a pizza delivered to her as a nice gesture because her service was shotty not long before she went missing (IIRC). She talks to her parents, maybe not about every single detail in her life, but she does when things aren't great. I've not been left with any impression that her parents would have been disappointed in her relationship ending with that dude, what's his name, the one hunkered down in his parents house not speaking or her dream trip or social media travel idea coming to end. I just don't see her hiding from or blowing off her family over any of this.
This all leaves me feeling not good at all about why she's not in communication. Hoping for a miracle here.
I have asked every SAR group I personally know to post her info and for others to spread the word in the various hiking communities. Hoping more folks might have saw him or her or them together at some point (trail, parking lot, pull off, public bathroom, etc.). Anything to add to the timeline. IMO