I am from the same valley in Alaska so I know the reason for her accent, as I speak with the same one. In the 1930's, because of the remnants of the great depression as well as the effects of the Dust Bowl, FDR gave the opportunity to 200 hard hit farming families from Minnesota, Wisconsin, and Upper Michigan to go to the Mat-Su valley in Alaska to settle in the fertile vally there north of Anchorage. The government sold them these 40 acre farms with affordable 30 year payment plans. While Alaskans come from a variety of places and can have accents depending where they grew up, a person growing up their whole lives within these small communities of Wasilla and Palmer where these farmers settled will have this "Minnesota" type accent. It is not fake but it also not an Alaska-wide accent.