My cat Foxy, who we've had since she was 10 weeks old, is now a year and a half old, but lately she's been eating certain things that she clearly shouldn't be- particularly plastic, cardboard, and most recently- found a balloon string and swallowed a big chunk of it! We try hard to keep stuff like this away from her but she always manages to find something innappropriate to chew on, but she also swallows pieces a good amount of the time which has me really worried-especially with the string since that can get lodged. I know she's not doing it out of hunger, since she went and ate the string a few minutes after eating her cat food and still even had food left in the bowl. She gets plenty of attention from the 4 people that live in the house, and we also have another cat that keeps her entertained as well so I would hope that it's not out of boredom, although she is very demanding of attention at times. What would cause this?