Nightmare Moon was victorious, and Equestria now belongs to her. Her rule is absolute. Those that question her face severe consequences. Those that don't have adjusted to the new regime.
However, despite her power and authority, Nightmare Moon is not infallible. No matter how determined one might be, ruling a nation is hard. Sometimes, she just needs to lie down and breathe. Some cuddles would be nice, too.
Thankfully, you're more than ready to help with that.