Has she gone broody on that empty nest, hissing and biting at you? Is she still working on getting to the "magic number" of eggs along the fence (sneaking off of "your" nest, laying along the fence and sneaking back)? If that's her plan, wait until she is off of the authorized nest, move all eggs to the authorized nest and utterly destroy the fence line hideout (put a board over it, for instance).
The hide out is in the open, no covering on them.
Its like she would have taken them farther away but the fence stopped her.
She was broody for awhile sitting on a rock for weeks.
So I can't see a magic number she is waiting for when one rock did the trick for her.
None of the eggs are hers because she was rock sitting the time I was collecting them.
I don't even think she is laying.
I placed the eggs out there a week ago and the weather here is hot hot hot so my thoughts are the eggs are going down hill fast.
I don't even know when she moved them. Could have been sitting on them for a few days first.