User blog comment:Maki Kuronami/Lesson 27: Screw everything, have a Samurai!/@comment-3257939-20141024031014/@comment-11188061-20141024031759

... Diego. If you expect her mum - or any mum, or any-one for the matter - to watch over their kids 24/7, it is a serious delusion. That is shoddy reasoning at best. Do try to theorize why Yue (probably) would appear at that timing and exclude Yang from the equation, and you'll get your answer.

And Yue was a woman wearing an extremely elaborate Grimm mask (probably referencing to a very powerful Grimm), with red eyes and a number of swords all augmented with Dust. So yes, of course she was scared as fuck against this unknown and ridiculously powerful opponent. But no, I have no idea how you came to the conclusion that she's therefore possibly related to Neo instead. The logic totally did not mesh together.