Translation:The small, green hen's pocket is empty.
idk. My first impression was that it was about an anthropomorphic chicken wearing clothes from some children's story (not that I have a specific one in my mind.) If a gigantic stretch of imagination is acceptablefor you, the small, green chicken could be a short, environmentally conscious, middle-aged/old lady. :D (Although, that would be very rude.)
Admittedly, I'm not doing the exercises themselves, so I have a different (probably worse) perspective than most participants. Still, I find this particular sentence alright, even though I suspect that it must have originally been in the Possessive skill, & so having so many adjectives is stupid.