Here comes the meddlesome friend trope...
Sure, she acts without an ounce of malice, but she does it for selfish reasons: to enjoy the thrill of knowing everything about the poor couple.And she does it willingly even when her friends warned her against it and knowing that her attitude caused problems (and pain) in the past.
Probably Luluca sees her behaviour as something harmless, and that's what makes her so dangerous. She would't stop and keep pushing, no matter what harm she causes. That's not what a wingwoman does.
Thank you for the translation.