She's remembered mostly for the awkward encounter at the library—you know, when she was helping Johan find a picture book for his friend. Being pretty clumsy, she accidentally knocked a bunch of books off the shelves, and Johan gave her one of those unsettling, dreamlike stares while they picked everything up together. Things got weird pretty fast when he found The Nameless Monster and just collapsed right there.
Later she showed up at the hospital with flowers, only to find out he'd already checked out. That's where she ran into Lotte Frank and filled her in on what went down at the library.
Fans generally agree there's something romantic brewing there—she clearly has feelings for him, even though the whole thing had a pretty disturbing vibe. The way she rushed to bring him flowers and seemed genuinely concerned suggests it was more than just a random library encounter for her.
Content compiled by AnimeList.moe from publicly available sources.