Preparing For Puppies

According to my calendar, and going by her previous litter, had Ziva been mated puppies would be due today. Ziva loved being a mother, and she did a fantastic job. She now has a large under carriage but no milk, she has been pick with her food for days, but continues to scrounge for tit-bits and steal cat food as if she's starving. Last night she refused her tea and in the evening she started digging on the sofa and chucking cushions about. She has again refused breakfast but after sharing my toast she found it necessary to take all the cat bowls off the unit and into her crate. Now she's sat on a chair with an expression of contempt as Sammi and Loki are play like a couple of hooligans.
Poor Ziva I feel so sorry, so sad that her expectations will not be met. It must be so hard when the body prepares for babies, but they don't arrive. Or am I humanising too much here? She's had a litter so it's not like it's a new to her, she must surely think she knows what's to come? I also hate thinking that she must be in a degree of physical pain, or at least discomfort. After all the digging and throwing stuff about is not nesting, (though we still call it that) it's a normal reaction to normal pain related to pregnancy, some say pain relief. Bitches in abnormal pain, (In trouble) don't do it!
Anyway a couple of days and I guess it will soon be over, for Ziva luckily for about 8 months and if all goes to plan with Sammi then hopefully Ziva can be spayed early in 2017... here's hoping eh!