I believe that every giantess, to one degree or another, has a latent urge to destroy and dominate tiny creatures, including in rather cruel ways. It's a kind of embedded program, a kind of script that activates. All biological beings are essentially a set of programs and scripts that are embedded in their genetic code for specific purposes. Humans are no exception; humans are deluded into believing they are above all this, some kind of exception, supremely aware and possessing free will.
By the way, to get to know Maryen better — I mean, the more real, frank, and sincere — you need to encourage her "dark side" and create a sense of comfort in relationship with MC
