The thing with Nora is that she is not quite delusional. She is mostly just dishonest. For example I don't think she really believes that I'm a "stalker" and I don't think she believes that Randi "sicced a hate group" on her, either. She just repeats these messages over and over for the group of gullible idiots who associate with her. Remember her dad is a journo and she is well aware of how to use spin and framing to shape messaging.
But creating a narrative to get validation from the hapless is only part of her spiel. What she is really looking for when she makes these outrageous claims is conflict (meaning: anything which is not unconditional surrender on Nora's terms). Then she comes into her own, because she hates anything which does not validate her, and hate is what truly gets her going. She will attack people for weeks, then continue months or even years later. This is what is happening to Randi right now and I'm sure she'll attack Shanley again, once she has collected and brainwashed a sufficient number of idiots for support.