>>718934000
She's less of a yandere (besides one event where some unfortunate gyaru uma try to raise her hand against the Trainer) and just more obsessed with the Trainer who was unfortunate to meet her during a full moon, when her beastly side was rampaging around. This results in having crazy!Still in Love biting the Trainer's neck (seen in >>718933031 as the first chapter of the uma story) and inflicting a curse/illness that slowly make the Trainer go insane, by losing sleep and appetite, suffering splitting headaches, eyes slowly turning a shining red, and a delirious obsession to see Still In Love running more.
And yes, her "beast" personality makes nearly every uma shit themselves in terror, despite she is otherwise naturally kind at heart albeit shy and easily suppressing her presence.
She's essentially a vampire horse girl.