When I was younger we had a cat that did this... she didnt even remove the sacks she just dropped them everywhere and walked away.
Is it possible that she didnt understand what was going on so she just dropped them?
I always heard that cats would suffocate or ignore their kittens if there was something wrong with them....I thought I heard this about dogs to
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD