[TomGuy]

You can pre-order tickets online or by phone, and you can pick up your ticket the day you expect to ride.

Per the Greyhound website, such online purchases have to be done at least 2 hours in advance.

That would involve a traceable transaction -- credit card or debit card, etc. Authorities/family surely would have checked for any recent charges.

As the story is developing and facts come to light, we know she didn't just go out for a jog and decide to run away. She had to do some pre-planning; even if a couple or more hours. If she bought the ticket in advance, she would have known also to have some cash for the trip (for food, etc.). Thusly, ATM transactions would be apparent. (Someone posted that she made an ATM withdrawal earlier in the evening -- the post didn't indicate the amount.0

[BigSkyFreeper]

Credit card bills would come out once a month, I'm sure they weren't checking around for greyhound ticket purchases.

[mabelkitty]

They took the computers out of the house on Thursday.
Bet they found Maps and bus schedules.