The mare eyes the bullet, and tries to think of a way to put the runes onto the projectile. It's kind of small, so she takes her knife she got from McClank and slowly starts to carve the runes into the bullet, making sure to check back on her notes so that she doesn't mess them up.
She had considered simply using ink or maybe some lipstick to do it, but if she tried to fire a bullet like that it would likely burn off and the enchantment would go away.
She finishes and admires her carving of "Sun""Power""Object" onto it. She then grabs her staff, and wonders what to do next. She tries tapping it against it, but nothing happens. She places the bullet on a flat surface and props it up so the runes are facing upwards, and then concentrates.
She places the staff against the bullet. She closes her eyes and wills it as hard as she can to work. She opens her eyes, and immediately has to squint as she looks at the incredibly bright bullet.