Hitch acts immature in certain ways, and seems to enjoy teasing and needling her fellow officers. She claims she chose to join the Military Police out of laziness, as it's well known that the senior staff are incredibly corrupt and she wanted to benefit from the system herself, but didn't take into account that as a newbie her superiors would dump all their work on her. When Marlo claims to have joined the Military Police for noble reasons, Hitch breaks out into laughter and it's implied she only got in through dishonorable merits.
Hitch first appears in Ch. 31. She is a member of the same Military Police unit as Annie Leonhart, and teases her for sleeping late. Boris Feulner is upset with Hitch's conduct and tells her to leave Annie alone. He also points out that she is the only one of their unit to have actually fought Titans in Trost District. He goes on to suggest that she's jealous of Annie because she got into the Military Police with merit, while Hitch herself only got in through dishonorable means. However, the conversation is interrupted by the arrival of their superior, who assigns them to protect the Survey Corps convoy carrying Eren Yeager.
Hitch appears again in Ch. 34, in the aftermath of the fight between Annie and Eren in their Titan forms, complaining about Annie skipping out on her duties. She was completely unaware that Annie was the Female Titan and therefore would be detained.