Cats are tenacious, strong-willed, determined, persistent, relentless, and whatever other synonym for "tenacious" there is to choose. One American woman living in France apparently found that out the hard way when her cat knocked the handle off her door while trying to get into her bedroom. A June 25, 2014 article in The Telegraph told how she live-tweeted her situation as it unfolded.
The Telegraph quoted some of her tweets, one of which listed everything she had tried to get out. She said, "Tried: coat hanger, nail file, credit card, kicking the door down. (Very well made door! Bravo French construction!) Any other bright ideas?" Friends who saw her tweets were worried, but she tried to reassure them by telling them she had a bathroom and the Internet where she was, so she'd be fine. She told The Telegraph that she started tweeting in hopes of getting some advice for getting free.
Cat owners often find that their cats will stop at nothing to get what they want. They knock on doors relentlessly, they meow insistently, they paw drawers open when they know there's something in there they want, and they'll dig in purses and boxes until they find what they're looking for. In short, they'll do what they want, when they want, and they'll get what they want, when they want it.
That can even extend to their will to live. A story on Life With Cats featured a veterinarian in Wyoming who took in an abused kitten. She was in such bad shape that she had head injuries that caused seizures. She purred and kneaded on her rescuer, who named her Tenacity for her strong will to live and heal.
Cats may be stubborn in this way, and in many others, because they're more disposed towards being solitary creatures. While feral cats do live in colonies, rarely do felines cooperate in hunting and raising young in the wild the way that canines do. Because of this, they don't have the same need for approval from us that dogs do (although they do still seek our approval).
A locksmith did go out to Berlinski's place to free her. As for her cat, well, even after the handle was off, it still kept trying to get inside the bedroom, along with the others. This wasn't an attack, it was just a bad set of circumstances brought about by a tenacious cat trying to get into a bedroom. Berlinski was trapped for about two hours.