I am fond of my big girls. They aren't my fence hoppers. It's all my lightweights who go up & over. However Lavender has more trouble than most. She paces the coop for a good 20 minutes most nights before she attempts the 1st roost. After that it is easy ~ only not last night. She fell a couple of times. When I tried to help it was worse because she still attempts to flap & I get beat up round the face which is ouchy.
I had to put a step in for Hattie. I would suggest that you consider it for her.