In response, the Scots were 21-2 after the loss of opener Ailsa Lister and Ellen Watson.
Darcey Carter, the top scorer in their previous three matches, was dismissed for a relatively modest 21 this time, but by then the Scots were only four short of Namibia’s total.
Captain Sarah Bryce did most of the damage this time, her 36 not out including seven fours from 17 deliveries, before Megan McColl sealed the match with a six from her second ball.
Fraser, who become the second Scotland bowler to reach 50 wickets in Women’s T20Is, told Cricket Scotland: “It means a lot. I think in particular joining Abtaha, who I idolised for a long time, she’s someone I really looked up to as I moved through the ranks, so to join her at that milestone is really nice.”
“I felt like I was in pretty good rhythm, it was turning out there so that always helps me, but I was having a lot of fun.”
Scotland next face Papua New Guinea, who beat the Netherlands by eight runs to record their second victory, on Wednesday.