For part of her skit, "You Could Become A Superhero From Inside Out if You Drink Milk," Tessa wrote dairy-themed lyrics to the tune of "A Whole New World," made popular by the Disney movie "Aladdin."
The 16-year-old junior at Clear Spring High School also won the Miss Congeniality and Best Radio Show awards.
"I have a passion for the dairy industry," Tessa said. "Washington County is the second-largest milk producer in the state."
Her family farm, Heaven Sent Holsteins, has been part of the industry for generations.
Dairy farming is a difficult life, said Brad Wiles, Tessa's father.
"It's not all fun and games, but it's a nice way of life for a family," he said.
Dairy farmers work all day, every day, yet only 19 cents of every dollar of dairy profits goes into a farmer's pocket, Tessa said.
A dairy princess needs to understand this way of life because she is its ambassador, she said.
As the seventh generation to work the 250-acre farm just south of the Mason-Dixon Line on Greencastle Pike, Tessa will represent farmers well, Brad Wiles said.
Tessa also will be the face of the National "3-Every-Day" milk campaign in Maryland, she said.
Whether she is at a fair or talking to children in a classroom, she will speak about eating three servings of dairy as part of a daily diet, she said.
"I do believe in it," she said of the campaign.
The coming year will be busy for Tessa, as she travels the state with her Washington County dairy maids, one of whom is her 15-year-old sister, Macayla.
Her mother, Cathy Wiles, said it should be no sweat for Tessa, who already juggles a full schedule.
Tessa is active in 4-H, FFA, history club, choir, show choir, drama club and indoor track at Clear Spring High School. She is a member of state and national dairy associations, and attends Five Forks Brethren in Christ Church in Waynesboro, Pa.
By Wednesday, the glow of winning a state title still hung on Tessa, but she had traded her sash for a rope tied to her Jersey cow, Times Square, and her gown for a pair of jeans, a T-shirt and muddy shoes.
Tessa will be at the Washington County Ag Expo starting Friday and was working with Macayla and her brother Gene, 11, to prepare their animals for showing.
She said she will she represent the state as dairy princess at the Expo as well as show dairy cows, beef cows and pigs.