>>149808810
>>149808888
>>149809017
She has super strength, durability and flight
Some mystical resistance to other magic
A connection to Otherworld that allows her to teleport there, and she was able to use that to teleport the team to the Nexus of All Realities in the Florida Everglades

And unlike other Captain Britains she isn't empowered by the Amulet of Right or the Sword of Might, she created her own Starlight Sword out of the Starlight Citadel
It allowed her to fight the alchemy using bad guy because the Starlight Citadel's magic overwhelmed it