Try a set of
Hully Rollers in the back of the vehicle. Then she can just set the bow in them and push the kayak forward into a set of saddles.
When I had my Trooper, and carried a canoe, I added a home made extension to the rack that had a roll bar off the back so I could lift the front end of my canoe onto the roll bar then lift the back and push it forward into the rack. Same could be done for kayaks. The rack extension was made of gas pipe and a piece of pvc for the roll bar that rolled on the gas pipe.
Or get her a lighter kayak.