You can find Athena at the same place you first saw her. But warning Zeus will come and take your stuff because thow who posseses them shall rule all of poptropica.
You find cousins as you are rolling around collecting stuff, you will usually find them by accident as I did so many times.
Stuff
In the modern world you can find Athena in the ruins of the city of Athena, which is a popular tourist spot. You can also find her on coins of Athens and Alexander the Great.
collecting stuff for the fight
There is no power related to Athena
Zeus steals your stuff after you collect it all and talk to Athena.
go to the sphinx's garden.
On a tree
Olympus.
Become a retailer.
collecting lots of coins will unlock you kart customations.
She was goddess of arts and crafts. Why? powers are just stuff the gods were born with. the Greeks needed a reason for weaving, and they chose Athena. Hope I was a help!