Magna isn't bad news, truth be told they have not done much with her character yet but I feel like Kirkman didn't bring her into the comic for no reason. Issue 149 comes out on the ninth, some crazy shit us going on so maybe she will have more importance after the 150th issue.
Im a few comics behind, but I started Reading the Plots on here. Can't wait to see the Whispers on the TV show!!!! I figured she is or will be an important character, just got that Vibe when they introduced her.