It seems the old links no longer work. I'll try to answer your questions from memory.
I've never seen anything about the routes she took to work.
She was killed at least two hours BEFORE she was to have started her shift, so I'm pretty sure she wasn't going to there when she was murdered.
LE commented that there was money in her purse when she was found.
Her employer described her as punctual and rarely late or absent.
I don't believe there was any blood in the car and everything done to her was outside of her vehicle.
I hope I didn't mislead you, but I am not aware of a video that had someone else in the car with her. The only video I am aware of captured her inside a store and she was alone at the time. There was a man standing in front of her at the counter, but I think he was identified & cleared of even being with her.
There was another poster that stated Amber had worked at the Tilted Kilt, but no link was provided. So, I am not sure about that.
From my LE experience, I can attest that crimes that seem random or have no apparent motive are the most difficult to solve. In most (not all) the motive will lead you to the killer. That is what this case appears to be.
Here is a news story from 2017 on the 4th anniversary of her death:
Four years later, Amber Berbiglia's murder remains unsolved