Alaska doesn't release death information until 50 years after the event. You can find out more information about release of death certificates at www.hss.state.ak.us/dph/bvs/death/default.htm
I searched FindAGrave for her but she didn't come up in their index. I searched the Petersburg Memorial Cemetery but she's not in their index either. It's VERY possible there are more cemeteries but that's the only one I could find on line.
She might have married again, however, the only marriage info online is 1950 and earlier.
You might want to check with your local Church of Latter Day Saints (Mormon) and see what death records they might have in their History Center. You can look up the church in your local phone book. I checked their on-line records but she's not entered there. But all their records aren't loaded yet. Successful Searching!