Mary knew if Gertrude was given enough time her secret would be revealed. It didn't matter if nobody believed her, the second someone came knocking or even peered through a window they would find out. She decided to take matters into her own hands. After all, nobody would miss her. Everyone she talked to hated her, or at the very least found her annoying. Yet she always found ways to yak their ears off. Mary remembered how the Smithsons down the street divorced because of Gertrude's snooping. She thought the misses was having an affair with one of her assistants just because he was coming over late some afternoons. Turns out it was nothing, just a matter of delivering important contracts to sign for her executive job. Still her husband believed Gertrude's suspicions and wouldn't hear otherwise.
Mary did not want to become another hapless victim, especially now when she was having more fun in her new body than ever before. If anyone were to find out, it would be Mary who would decide to tell them, no one else.
She returned to the vial box and looked up the cat vial. She discovered one vial for every type of cat known to science. "Perfect," she mooed, and plucked one out with her thick fingers. Then she went to work making one of her more popular dishes, lasagna. Mary believed in cruel irony after all, as Gertrude always professed a love for cats, Garfield and her lasagna.
While waiting for it to cook, Mary went about finding a decent outfit. Her jeans were still very tight on her, even though they were fully unzipped. She donned a pair of sweat pants with an elastic waist that were much more comfortable for her small but cute udder. She also realized that her bra was chafing her underneath her shirt. Lifting it up, she saw that the fabric was hanging loosely off her chest. Her breasts had completely disappeared. She didn't even have nipples. "Wooooah," she said. She took another look at her udder, which was poking out the top of the sweat pants. "Guess it's either ooone or the ooother." She removed the bra, which was a bit hard with her large hoof-like nails, but she somehow managed. For a second she considered putting on shoes, but realized that not only would her hooves not fit, they were shoes in and of themselves.
Then she returned to work. Once the lasagna was finished cooking, she removed it and poured the entire cat vial into it. She paused. "She'll need all oooof it to change fully. Maybe if I..." Mary corked the vial, watching it refill. Then she dumped it all out again. "There, now she ooonly needs to eat half for it tooo wooork."