This is actually pretty legit. But then again sincerely suspecting someone and unintentionally causing troubles are two different things. In Lesson Zero Twilight was clearly unthoughtful and her original plan which, although questionable, itself wouldn't have been that bad, got out of hoof, whereas in Canterlot wedding she did exactly what she planned to do, only that this time her actions wouldn't resolve anything anyway. Yes, she was right, but she did not have the means to convince others about it. The magics Fake Cadance did were indeed suspicious and would've actually worked as a strong evidence... *desk slam* ...had Twilight mentioned it was green instead of the usual pink! * www.youtube.com/watch?v=l3WUFD… starts playing *
Er, I mean, I could how Twilight's friends just abandoning her like that came out of nowhere so that even Trollestia would say "What? I didn't plan this, I swear!" and mean it.
But the "I have a lot to think about" line (and I'm pretty sure it WAS "I have a lot to think about, not "YOU have a lot to think about") was pretty mean and I was too taken aback by the sheer cruelty of the scene to remember Lesson Zero.