She? looks like an adventurer; wire wheels in 1921 and bumper. I'm guessing that she has a lot more money and can afford a more expensive car but being the outdoors person that she is, chose Ford Model T for reliability, and ease of repair.
I dunno Verne - wouldn't a true outdoor type choose an open car over a coupe ? ; - )
The license plate is a dealer plate.
That's what Jay's caption says too - I like the WN plate (Washington State) - be neat to research which dealer that plate belonged to which might give a clue as to the whereabouts the photo was taken - Stevens Pass, Snoqualmie Pass, White Pass, Chinook Pass ??????????
Or a dozen others around here !
It appears to be a metal plate. My brother has a 1919 Washington dealer plate that is printed on hard paper with metal trimmed edges.
I have a list of the 1st 5000 Washington State issued license numbers but there are no dealer plate numbers.