A lot are jumping on the hallucinations train. It could be but isn't supernatural abilities to see what others can't the bread and butter of neji's works? Personally wouldn't have thought of it that way with this author to be honest.
It is nice that she did what she wanted to, but didn't she basically get disowned as a result?
I'm sure her parents love her more than to do that.
Page 32 she says she's not part of the nishikino family anymore, whether they fully isolate themselves from her is not to be seen but am pretty sure she's been at least thrown away the family name,. She could take her mothers maiden name or if they got married, Nico's.