What part rings false?
I haven't dug into the whole scenario, and I haven't seen even a vid capture of the site (I get redirected to a porn site... the Internet knows me so well.

), but my understanding is... teen codes mild anti-Trump humor/entertainment page game (kittehs attack Trump), Trump's legal tem issue C&D letter, girl takes Trump name off of project but still gets pressure to kill the site. And here we are.
Remember... besides the new China trademarks, right around election day he renewed several hundred product trademarks for proposed "Central Park" tchotchkes. He doesn't even make
all of them (I believe), just ties up the name (they're not even "Trump" branded). He certainly didn't review all the renewals that week... his legal staff would have taken care of that (hell... he's on record
in court saying he doesn't even read all the property contracts he signs).
So it's not like a C&D against this girl would have taken any time out of his day... he may not even have been aware of it until after the first round of C&D letters.
That's actually likely, now that I think about it.
He pays a legal team to be watch dogs/attack dogs. It's what they're for.
Now if you're saying it's all a hoax and there never was a kitteh/Trump slap fight game, well, I can't tell... there's porn on.