My partner has Cunrgonde, our 1.9l WBX, in Wolf Creek, just north of
Grants Pass. She says it won't shift out of 3rd, and only into 3rd
with great difficulty. No other gears. She also says the clutch pedal
action seems normal.

I  guessing rear shifter linkage is bad, but your suggestions? Nearest
trustworthy shop? Try to drive it to Eugene?

Thanks!