If you can't get measurements from a Redwood owner, I have an 'X'.
Given both bikes can use 700c & 650B, and the other frame dims are what make the differences in Dims (Head tube angle is same on both bikes) - I would be surprised if they're NOT using the same fork on both bikes. visually it looks the same.
here are the dims on my 'X' fork
A/C : 375mm
other dims to consider..
measuring 50mm down from Crown (roughly where the widest of tire width is on my bike) the clearance is 62mm +- 1mm
I have a Conti Speed ride 42mm 700c on the front.
Clearance from top of tire to crown is roughly 28mm +- 1mm.
...if this helps...
not that this impacts for your wife, but I'm certain I could easily put a 50mm-700c gravel tire in this fork.
Ride On Yuri