
Glad to hear that the temp is OK, I have been very worried in case it was up. I would be giving water with glucose in it, and make sure the fluid intake is fine, even if she does not want/can't eat. At the risk of repeating myself, while other curley tailed breed may lose the curl post whelping, this is not normal in this toy breed (breed edited), even after a C section, and is a very strong indication that she is feeling very miserable and unwell. I don't want you to feel that I am being unduly lacking in optismism and the upbeat factor that lots of other posters are giving, but I am very concerned about your girl, and whilst it is lovely to get lots of good feelings and and encouragement from fellow CDers sometimes personal experience of a breed and knowing what can be important signs to look for which are breed specific are more important than bolstering up the breeders feelings. I am sure she will come through this OK. but I think the most important thing is to have her well as quickly as possible, both for you, her and the pups.
Don't be to concerned if she wants to sleep away from the pups, with our girls who want to be good Mums we arrange the whelping area so that she has free access to a space just in front of the whelping box to rest away from the pups, this seems to settle them better. This breed don't take to enforced confinement well, so being able to be close to pups and pop in and out for feeding and cleaning suits them fine, and they can snuggle them if they want to.
The even weight gain is great, and what is to be expected form a healthy litter, showing you are supervising the feeds well and making sure they all get enough. As they get a bit bigger you may find that the bigger ones gain a little more, proportionate to the size difference.
Re the metacam, if she is already feeling poorly and this is making her sick it is a vicious circle for her, poor poppet. However, I think your vet realy needs to get to the bottom of why she is feeling poorly, as it is not usual after a C section which has gone well. It is worrying that she is feeding the pups so well, but has had so little herself, which is why a quick diagnosis and fix is so important.