What I can do is take some pictures and do some more test.
After that I can sell it, keep the money on my paypal account and refund the buyer except paypal fees and shipping after a certain period of time.
If the lens is the older chrome lens the aperture and speed rings are locked together for EV values.
Two things I would try:
Try moving the aperture ring toward the lens mount and rotating either ring.
Second guess is a small piece of metal(?) at about the 10 o'clock position(viewed from rear of the lens)
Depress it and the pair of rings should move independently.
Be aware that BOTH the lens and body have to be cocked to remove or install a lens. If it's forced, it's not an inexpensive repair.
Hold the camera as you would taking a shot. Look at the top of the lens. Are the two red lines below the aperture/shutter readings at the very top? If so, pull on the metal tab on the right side of the lens and turn the shutter speed dial. As John pointed out, the shutter/aperture rings are locked at a certain exposure value, some combinations of which prevent you from turning the rings. Try moving just the one ring, and after it's changed you'll probably be able to move both again.
Hasselbalds can be a bit counter intuitive - such as the linked shutter/aperture rings. And having both body and lens shutter aligned when mounting lenses. It's great that you want to help your friend sell her cameras, but please read the manuals for body and lenses first - after all, they are still her cameras. They should be available online.
Hasselblad lenses can have very different values depending on which series (C or CF, T* or not, black or chrome). Backs can have differing values depending on whether they're the "A" back or "C" back. A back with mismatched insert and shell will have slightly less resale value than if matching.
It's helpful to look at KEH's site to get a sense of the relationship between versions of the same item and price (as well as condition and price).
"Far more critical than what we know or do not know is what we do not want to know." - Eric Hoffer