It is totally possible to abort puppies, it's actually I believe just a spay while she is pregnant. The process of spay, which is removing all her reproductive organs will in itself abort the puppies.
It seems as though your trying though, so I give you kudos for that. I'm sorry if I seemed harsh, but really, ChiBree has a Chi, and not even a month ago, her girl did die on the operating table, and they had to revive her.
Pups for a small breed like a Chi is very risky.
I wish somone like summit, or Red would see this. They would know the exact term for what the operation would be called... Hmm..
This is the way, *I* personally would look at it. It may sound harsh but whatever.
Roxy, (who is spayed in reality) is pregnant. There are some issues regarding HER health with this litter. I *LOVE* Roxy, I don't know these puppies. It's harsh, but I would rather, abort those unborn puppies than risk losing my beloved Roxy. SHE would be my upmost concern with the litter, not the puppies.