She realizes its not the best choice but she believes in living dangerously and chooses to drink ALL the contents of the whale vial, after all she has a nice 40ft inground pool out back she hardly uses. Best of all the neighbors can't see in. So trying to be practical she throws a large box of salt in the pool. Puts the dog vial on the diving board (so she can get to it easy after her change), gets naked and pours the contents of the whale vial down her throat.
"Not a bad taste, oooh, thats odd, "Buurrap! excuse me" Embarrased by herself she quickly gets in the pool and waits for the changes to begin. First her cow parts retract into her body, but at the same time she begins to change to a grayish blue color and her skin begins to get clammy. "This is so cool... wait, are my legs getting longer?" They were lengthening at a rapid pace. She felt an urge to stretch as she laid on her back... she bent her head back to look behind her and when she tried to move it back it wouldnt go.
"Uh, oh" she managed, "Im starting to think this wasnt a good I Deeeh Aaaaa!" Just then her head began to grow at an enourmous pace, at the same time her arms were turning into fins and her legs, feet and ass were fusing together and rapidly expanding. Her center of gravity had changed enough to cause her to flip over on her belly, her breasts and female parts still retracting. Leaving her with a smooth white belly.
"Oh God, the pain!" she was able to garble as her head grew and grew, teeth becoming long and pointy in an ever expanding jaw. Eyes growing and moving to the sides of her head. On her back a large dorsal fin began to grow, and her arms were making their final transformations, feet followed leaving her about 20 feet long. After her change she took a few moments to recover her composure and then set about trying out her new body. At first it was hard to get a handle on her new apendages but soon realized how to thrust and manouver throug the pool. She suddenly wished she had done this in the ocean, but promised herself she would take the trip and try it out soon. But for now she need to get out of the pool, after 40 min of being a big fat 20 ft whale in a 40 ft pool, she has had enough. She bumps the diving board with a fin and the dog vial drops in. She bites the bottle and swallows the contents. She swims around a little more waiting for the change.