@Draco Dei
They fly by magic, wings are just an outlet for said magic to manifest.

|| Even assuming literally weightless wings, to lift a pony of 100 kilograms (150-200 average, but let’s say hollow bones or whatever) you’d need an area of at very least 4 square meters for a wing loading of 25 kg/sqm (physical max until a bird cannot fly). That’s a wingspan of 8 meters length by 0.25 meters width. A big albatross is 3.4 by 0.16 for reference.
A falcon/hummingbird would need a way lower wing loading to be agile, thus easily getting carpet-sized wings on a dashie.
Either that or a much thicker atmosphere that increases buoyancy by a LOT.
So long big wings and albatross-styled ones would be the most realistic for a pegasus. ||

TL;DR, magic flight! Wings can be what you want!

Eh, long wings for more realism are fine, but I’d like to see them with more depth from front to back. She is the equivalent of a high performance fighter jet (breaking the long-distance record by the guy who framed her not withstanding), not a glider.

Or to put it in bird terms, she is a peregrin falcon plus humming bird (maneuverability), not an albatross.