She’s actually part earth pony. That’s how she can carry any package large or small.
I mean she was carrying an anvil, a haybale wagon, and a piano with Raindrops (albeit they dropped it) so it’s not improbable. :P
“I got my formal training at the Skyrim Courier’s School. Speaking of that, please sign for this. I have a ‘letter from a friend’ to deliver to somebody who’s been shouting a lot.”
@GenericArchangel
Plus, she easily did some considerable damage Ponyville Town Hall by complete accident, so it’s almost frightful to think what she could do intentionally with that kind of physical strength.
She probably just can, she’s a strong flyer. Used to win races before her vision went bad, so I’d imagine she’s pretty capable in the wings department.