Bye bye Beryl?

It seems that we have lost Beryl, our Speckledy hen, leaving us with just one hen, Edwina - who is looking rather sad and lonely.
Chickens will always return to their house to roost at dusk, so normally both hens are waiting for me when I go out to give them some corn as dusk approaches. On Thursday Beryl was unusually nowhere to be seen, but after a few minutes of calling and corn-box rattling, she appeared from the next-door garden. But on Friday evening she simply didn't appear at all and has not been seen since.
It is possible she's been taken by a fox - Edwina had an extremely lucky escape from the very jaws of a fox last summer, but I haven't seen any foxes at all this year. It has also occurrred to me that Beryl had not been laying any eggs in the nestbox for a couple of weeks before she disappeared - she may have laid a clutch of eggs under a bush or hedge somewhere and be broodily sitting on them. The problem with this is that they will never hatch and she is quite capable of not coming off the nest to eat or drink. I'm not certain, but I think she could end up dying of thirst or starvation. We've looked everywhere we can think of in our garden and next door, but no sign. So I think it may be "Bye bye Beryl", even though I still hope maybe it's only "Au Revoir"...