I can't find it now, but I remember distinctly Coates's wording in the first interview Tuesday was "we don't even know for sure that it ever left," which shortly afterward became "it definitely left before the first search and came back sometime after." I guess his PR/campaign person pointed out how bad it looks to admit you didn't really check the open sided carport close enough to say for sure that the missing person's bicycle wasn't sitting there in plain view. It's frustrating, because it means there's really no way of knowing when it came back: I have no idea how often her mom looks in that carport, and we can't really trust the reports because of the pretty significant backtrack of going from "don't know" to "absolutely sure."
She's been a long distance runner since high school at least. Maybe junior high, though I don't remember that much as I never made it past being a decent sprinter, and a couple of years behind her in school. She's got the legs and the endurance to get that bike wherever she wants to take it.
I've also never wandered their fields that I can recall, but most of us do have some cattle trails as well as at least cleared strips big enough to get a pickup through. Sometimes there are gates to adjoining properties, sometimes not. Sometimes the bottom strand is high enough to slide a bike under, sometimes not. It would be hard to say how easily she could travel very far off road around there without actually walking their fences in person. With the tires on that bike, I'd be concerned about mesquite and cactus, but otherwise it would handle the sandy soil and some moderate rocks just fine. Can't see how aggressive the tread is, but having worked in a bike shop here, I've found a lot of 2"+ wide tires that were fine for road riding, just not as fast or efficient as 28mm or smaller.
Since getting a bike to 205 from her parents house would either require having something you're able to ride on a sandy dirt road and some gravel, or pushing it for the first 15 minutes of your ride, most people would just go for tires that handle dirt and gravel well, but with a tread that doesn't rattle your teeth any more than the bad chipseal job on several of the side roads already will. (Though last time I rode 205 it was buttery smooth, while I ended up turning back from trying two different side roads because they were just too rough to ride on 28s.)