The Questions Keep Popping Up!

I haven't had much time lately to really let my mind wander about the events leading up to the murder of Marian Louise Baker, but today, during a very long drive from far on the Eastern Shore back up to Dewey Beach I did a bit of thinking again....
I still am stuck on WHY Marian would get in a car with a man she verbally claimed "made her sick".
I keep going back to the testimony of Mrs. Nancy Stonesifer, her coworker in the Cashier's Office at F & M. She testified that Marian had returned from lunch, never even removed her coat as she sat down briefly at her desk, and commented that she wished she didn't have to go to the bank since she was suddenly swamped with work. She said she was worried that she wouldn't make her hair appointment, which was scheduled for late afternoon, around the supper hour.
Now WHY would Marian suddenly be so relaxed and have so much free time that she would agree to go for a ride with Ed Gibbs so far out of the way of the college?
Ed Gibbs testified that when he finally stopped the car near the Harnish cottage, the last thing Marian said to him, immediately before he reached over and started to strangle her, was the
"scenery looked pretty". None of this makes one lick of sense. Not one bit.
I can't explain it, but there is FAR more to the story than we have been told. And I aim to find out what it is.
I guess I'm back on the case! :)