So sorry about your loss... It is devastating to lose all that hard work and devotion, not to mention they are very special to you. I had a couple of someones dogs come in the yard day before Thanksgiving last year and kill half my flock... My fault on that one though, got too comfortable letting them free range during the day. We are usually here when the chickens are out but that day everyone was on the run. I have kept a close reign on this flock of girlys I have now, although the Pheonix/Game flys over the fence on a daily basis, I think she can take care of herself pretty much though she's an excellent flyer.
Lots of hugs and condolences for you... and don't give up.