Certainly it looks like she's got it in the bag if she approaches the problem of eliminating the remaining princesses intelligently. But there's no position so secure it cannot be undermined with sufficient overconfidence. Should she tip her
hand hoof and not realize it, 'Tia and Luna may yet be able to take her down with a surprise attack at a time and place advantageous to them.
Certainly true. But that only applies as long as she remains a classic Mary Sue, and I have a feeling there's a subversion coming up. I can't remotely prove it, but my gut says something surprising is going to happen. And if that something turns out to be a defeat at the hooves of the remaining princesses, I want to be able to tell Squishy "I told you so."