Implications of what the discovery of Naia means
The discovery strengthens the bering strait land bridge hypothesis because if I remember right they did genetic analysis and her ancestors were almost certainly east asian. As for opposing migration models, they involve boats. Some evidence exists for polynesians reaching the west coast of south america, but probably in small numbers and not before humans walked in from the north. There is more information here: https://en.wikipedia.org/wiki/Models_of_migration_to_the_New_World