The insidious thing about the Panorama Farms course is the steep cambers around a lot of the turns, sloping the curve downward to the outside radius. There is significant camber (essentially running on the side of a slope) even on some straightaways. Courses with these types of camber are deceptively difficult and can contribute to injuries.
This course would typically favor a shorter, compact, athletic athlete (Tuohy) over a taller athlete (Valby).
You can see the course’s hills starting at timestamp 13:30 (11:10 into the race).
I think the unrelenting cambers are a worse challenge than the hills. If it’s cold with frost on the ground, the course will be even more treacherous.
Notice starting at timestamp ~11:45 (9:22 into the race) where Markezich has the inside tangent. Then Tuohy looks back over her shoulder, the camera cuts away, and when the camera close-up returns, we see Tuohy stutter-stepping (9:32 into the race) to avoid tripping-contact with Markezich. (Some particular runners would have likely tripped the front-runner in that situation, purposely or not.)