It really depends on if the gifts where hers personally, or if they where intended to remain with the Governors office.
At least one was intended for her personal use, the gold nugget lapel pin from the city of Nome. Even that gift isn't necessarily unethical or against the law. We would have to review the state laws from Alaska to find that out.
*edit* The article doesn't state which gifts, if any, were intended to stay with the Governors office.