I don't think she was intended to be one when she created in Spawn, sure. But now Thor is her brother, she's been on both the Guardians and Asgardians of the Galaxy, and she's about to be on a team with Spider-Woman, Spectrum, Blade, Winter Soldier, and Wiccan. She's a superhero.
Here you go: https://marvel.fandom.com/wiki/Aldri..._and_Abilities
Sure, but Jean Grey*, Quentin Quire*, Jessica Jones*, Elsa Bloodstone & various Runaways show that codenames aren't for every superhero.
*Their real names have definitely been used more than their codenames.
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I thought about that before my initial post: in all those cases, the surname is essential. Angela is just... Angela. It isn't Jean, Quentin, Jessica, Elsa, Alex. It's Jean Grey, Quentin Quire, Jessica Jones (the alliteration is a key part of what makes it a catchy and memorable name), Elsa Bloodstone (Bloodstone being a surname that provides a ton of personality to the name), Alex Wilder. Imagine is James Bond was just James. You lose the effect.
I really think the name is just coasting based on the pun and your standard comic book character inertia.
I like Angela as her "codename". And she's asgardian and they just uses names like Thor, Sif, Hela, Lorelei or Loki (The Enchantress seems to be an exception, same for Skurge)