the problem is that you rejected her and made her feel unloved and unwanted, yukkuri are assentially children that needs to know there parents loves them.
Read the story again yukkuriking, you missed the point, this isn't a case of someone making someone else feel rejected, but a case of someone who wasn't able to handle someone else who had a serious and unhealthy obsession with something to the point of attacking when that obsession was denied to it.
Alice was obsessed with clothing she couldn't wear, miss wasn't able to handle Alice's obsessed self and reacted badly to her attitude and later attack. Besides don't compare yukkuris to kids, specially adult ones, there are things that yukkuri do or know that kids don't, just because the average yu can be stupid, immature and simplistic, that doesn't make them "kid like", there is a reason why the term "man-child" exist.
But that doesn't seem to fix the root of the problemI tried giving her clothesSomething is definitely wrong with herIf she goes that far, it can't be just her rebellous age, right ?And I tried looking in yukkuri raising booksI tried asking the people in pet shopYukkuri caring is more difficult than it seemsHow did it came into this...