Cat question

So the new D.Va kitty loves to chew on rubbery/plasticky things, most
recently the rubber-ish mat the treadmill sits on. We’re worried about her
swallowing bits of things, of course, and are wondering if anyone knows of
good chew toys for cats?

We have some bitter spray, but it worked for about 24 hours and then I
discovered she’d chewed up even more of the mat. :/