Sounds like she needs a playmate to keep her busy. It's just a thought.
My daughters cat likes to chew on thread, elastic, yarn you name it. A few months ago he got a hold of the thread on the sewing machine. It cost them $1,200.00 for the surgery and all. They took out 5 yards of thread. I think the more he tried to spit it out the more he ingested. I had a dog once that got a hold of my pin container. Lucky I had a cow magnet nearby and just rubbed it around his mouth.
I don't have any better ideas then what's already been said, good luck with the kitty.