In order to get her workouts in, Mansbach would run on the River Hill High School track at 5 a.m., hours before students arrived at school.
From a running standpoint, Mansbach's pacing is what stands out to Gonzalez.
"She has that natural ability to be very consistent. Hannah's main strength is being able to maintain a good, solid pace consistently for an entire race. She just keeps churning."
Soon after Mansbach began training with Gonzalez, he decided to pair her up with his daughter, Ellie.
"It just sort of happened naturally. I saw that Hannah was running pretty well, so when I was planning workouts I was incorporating Ellie and Hannah into the same workout," Anibal Gonzalez said.
Ellie, a junior at Catholic High School in Baltimore, and Mansbach quickly built the reputation of being two of the top private school runners in the state. This past fall, the duo went one-two at the Interscholastic Athletic Association of Maryland cross country championships.
"Ellie and Hannah are pretty similar from a competitive standpoint, but there's no rivalry here," he said. "You need to get someone to run with. Hannah's so talented, that there really isn't anyone at her school or local for her to run with. These top tier girls spend a lot of time alone on the road alone all by themselves."
Ellie even acknowledges how much having Mansbach has benefited her.
"If I didn't have her, I don't know where I'd be today," she said. "From a morale standpoint, she definitely boosts me, and that directly correlates to times. I have seen a huge improvement in the past two years that I've known her."
Next year when she joins the Terrapins, Mansbach will have a whole new set of training partners. But, even though getting a scholarship to one of the top local college programs was quite an accomplishment, she's not taking anything for granted.
"You're never satisfied with what you get," she said. "You always want to keep getting your numbers down."