Honestly, I think she counts more as a special kind of yandere, which locks onto the first target that catches her fancy, and will never, ever let go...
It's a sadly quite common disease in fiction, where heroines latch onto random losers as their sole motivation for no reason other than that it is required for plot advancement... actually, I think they DO have a name for it, "Love at first sight".
I-I wouldn't exactly call myself beautiful...I-I'm so very sorry about earlier...How amazing... that face...! Aah! It's so cute...!Mmmm, that's okay! It's been 11 years after all, of course you won't remember what my face looks like!Geez... mom, stop telling her weird stuff...Takashi-kun... acting embarrassed!?Mmmmmm, I take back what I said.A woman in love is beautifulPutting that aside, you've become so beautiful now!