She smashed her way out of her glass cage which was in her owner's garage.
Her owner, Paul Tomlinson, said she'd not been fed for two weeks and had been due to be fed her usual diet of rabbits and rats at the weekend.
This means she's hungry!
And Paul said there's a chance Tracey could attack people's pets, and possibly even children if she can smell animals on them.
People in Sheffield have been warned to be cautious, and to call the police if they spot Tracey slithering around.