Mary downs the whole vial, quickly getting it over with. The thought of her friends giggling and teasing over her being a mere housefly is too enticing. There's just something about it that simply makes her blush.
Her hands and feet get thinner as she feels two more limbs pop out of her sides. One of her eyes pops outward with a hexagonal grid on the surface. She nearly falls over as she looks through her new compound eye. She's never seen so much detail in color and lighting before! Her train of thought is interrupted as her other eye pops out.
Her rear stretches out into an abdomen while her entire body shrinks down, down, and down. Everything looks significantly taller. Even her stuffed toys look like they could smush her if they fell over. Two translucent wings pop out of her back as they start to buzz in excitement along with her.
"Oh wow," Mary exclaims. "This really works! I wonder what else I should try..."
She gasps as she realizes her voice is becoming much higher pitched. Oh shoot, she didn't consider about communication. As her voice continues to sound like she sucked a tank of helium, she can only hope her friends know what happens when they see the empty vial.
The vials! She facepalms with her new clawed leg as she realizes that she should have opened a human vial! As the table becomes as tall as a skyscraper, she figures she'll just have to find some other way to open one.
As tiny hairs grow all over her body, Mary flies out of her clothes before they could collapse on her. Fly? Whoa! She's really flying! If she could express her joy, she could. It's hard to do that with a proboscis however... "Bzzzz!"
Mary gasps as she notices the doorknob is turning. She flies off quickly to the nearest wall, landing on it with perfect grip. She's amazed how well she sticks on; she'd probably never fall off!
Two of her friends enter the room, looking around for presumably Mary.