[Randrak42]

Spoiler for Waffuuuu:

Wouldn't it be funny if the reason why Zen has memory loss from around that time was because he refused Medaka and she went into War God Mode for the first time from being hearbroken and somehow injured him?

But anyways, Medaka was too intelligent as a child for her own good, taking things normal kids her age said so seriously (like the reason to live or in this case, big impact from rejection...from a 2 year old she didn't know).
She was what we call around here, as a smart dumb girl. She was quite intelligent but still naive and uneducated in social ways (as was demonstrated often).