After some running around, she did end up in my porch, and that's where I succeeded in getting hold of her and inspecting feet and wings. She was absolutely fine, apart from a bit of a heart attack, as I could feel her little heart pounding in my hands as I opened the door back to the garden and threw her in the air to check on flight abilities.
She was in good spirits after that, as she wasn't injured, and continued to plod around the garden, drinking from the pond, unearthing worms and picking crickets and spiders in the high grass. So I left her to it, ensuring that both William and Victoria stayed inside. I could see them with their mouths wide open, spit smeared all over the treble-glazing, and figured that Duckie may not have been able to fly after all if I let them out too.
She was still around when I took them for a spin of the garden after dinner, both on lead obviously, but she was clearly setting up for the night as she was calm and cozy in the grass. I checked on her again at nine and I saw that she was surveying the scene from the high-rise of the steps outside the patio doors, probably wondering where on earth the rest of the posse was and whether it would be safe to stop here overnight.
That's what she must have done as I didn't hear a thing since and this morning she was gone. Good luck Duckie, it was good to have you!
