Nemesis was the goddess of righteous anger.
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Poseidon
Medusa angered the goddess Athena.
She wasn't really the Goddess of War (Ares has that covered). She was the Goddess of Wisdom and War Strategy, and she would only fight for a cause. She's also been known to be the goddess of righteous war and justice.
Athena was a goddess in the Greek pantheon, and the favourite daughter of Zeus. She was the patron goddess of Athens and the goddess of wisdom, strategy and war. She also helped those humans who worshipped her and who, by righteous conduct, deserved her assistance.
No, Athena was never banished from Olympus. It really isn't in her nature to do something that would anger her father, Zeus.