There is another option. Instead of a ramp, you can build a hanging step like this. Even Silkies can hop. Take the steps down low enough to accommodate her abilities. A hanging step like this take up far less room than a ramp. That's why I have them on my coops.
All she needs is incentive. Toss some scratch grain at the foot of the ramp. When she sees that the others are getting her share, she will quickly get her little tail down the ramp. Repeat the next morning if needed.