It was an interesting theory I came across here, and I know that given the ambitious nature of Ocean's plots, he likely has at least 5 tangents running, why not that as well? Noji knows Nami is flighty and has the attention span of a goldfish (except when she chooses to be serious). Nika takes things seriously. Imagine if it was Noji's writing and Nika say's "Pretty much sounds like 'I'm on my deathbead'".
Also, establishing first contact - I'm pointing out Katie has plenty of opportunity whenever she wants to bump into them, so it's not a given that she appeared because of that. We already know that Nika appeared last minute, and none other than Mila and Vic knew Nika was planning on gatecrashing - Noji didn't know until it was time to leave for the club.
The other great theory someone mentioned is the whole bookclub scene mirrors these threads (I am guilty
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I dont really think Noji would be this offended about Nika saying something bad about her kids-book, she raised him since he was a little boy and usually parents know about the possibility of their kids sometimes being obnoxious, even more in a case like Nika lol.
Immediatly after these renders Katie walks up to Nika and to Nami afterwards.
And never ever has Noji of all people an outburst like that just because she feels uncomfortable about Katie hearing her book (which Noji would have provided in this case) being read. We never saw Noji behave like that and i think its very certain that she wouldnt if it isnt about something important.
And as i said, it was planned that Nami was tagging, the people in the bookclub knew about it and one of them told Katie about it and therefore she attended (Nami wears Leia's earring, it isnt only about Nika, Nami is equally important).
I dont think Noji would be this pissed about Katie being there without Nika tagging along as Nami can handle stuff if nessecary. Im sure Noji had at least considered the possibility of a Zane attending when getting knowledge of Nami coming with her (and therefore didnt wanted Nika to tag along), it was only Nika's last minute decision which made it shitty for Noji.
And Katie just got lucky, instead of only meeting one of them she was able to introduce herself to Nami and Nika at the same time in surroundings where shes able to watch them interact with other people and not in an awkward college setting.
Noji very obviously doesnt consider Nika ready to tackle his past yet, thats why she hides her connections to various people including Amber, Sasha and her mother and the Zane's.
Thinking about it the whole story about the tennis-club being too expensive is made up too, Bella offering Noji to get her a better deal as her mother knows sasha's mom is kinda funny considering Noji knows Amber and Elena Petrova herself and apparently knows anyone with influence and wealth lol.
But yeah maybe Ocean just thought: "Lets throw katie in there to mindfuck everyone!"
