Well imagine how hard Celestia and Luna had it when they first became princesses. At least in their case they've had thousands of years experiencing this sort've ordeal, even though Luna spent most of her life trapped on the moon. Twilight Sparkle has only been a princess for maybe a year or two, hard to count, and so she's still new to this thing. And now here she is, prepped to run the whole country and she's barely had time to prepare.

7014270
Definitely, Twilighting. But, her best friends are there for her now more then ever before since they first met.

Oh yes, for sure. After all the years of knowing what Twilight would do, her friends are usually prepared for it. Least Twilight has made an effort to prove she's more than just the pony who freaks out... A lot.

7014283
Twilight can’t only one who normally freaks out, why the Mane 6 have their moments of freaking out too.

7014287
Yeah... But Twilight is practically the 'Queen' of freak outs... Or 'Twilighting' in this case. She's the one member of the Mane Six whom the group casually pokes fun of more than any pony else. More so than Fluttershy, at least during the early seasons.