Chickassan
RIP 1975-2022
Iv'e got levels going on now so she dosen't have to just drop, or she can use the ramps whatever floats her boat. So far the only dummy that wants to jump out is Cookie but when he gets fatter I bet he will stop. Eveything is pretty wide on the new side of the coop for those fat faverolles so she'll probably be ok. 

They don't all get that huge. Jazzy will do a straight drop from the roost to the floor too. She's always the last one down. I make it inside before she gets down.
My Buff brahma only got to 8#. She was sweet and small(ish).
Your Sallie will want to roost with her buddies. If she can get up to where they are she will. I keep lower roosts to prevent leg injuries.