Suspiscious of Harry, not knowing whether to believe he was a good guy who would help them or kill them instead, Meryl back-handed him with a shovel-sized fist. She stops Ace from shooting him thinking the wizards would kill them all. She, Fix and Ace ran off after she tossed Harry dumpster.
When Lily disappeared, she and the others tried to find her, and eventually hired Harry Dresden. Meryl was accidentally shot by Ace while the latter tried to kill Dresden.
Meryl was wounded gravely in battle by Winter KnightLloyd Slate. In order to help, she Chose to become a full troll; she rejoined the battle in her troll form: huge, strong, ugly, and with green skin and blood, and wielding an axe. Talos hacked off one of her hands, but was brought down by her. She died soon after.