Sasha is a middleweight reverse-joint AC equipped with a sniper rifle, a middle missile launcher on each back weapon slot and an overboost core.
Heaven's Blaze is sort of the average pilot among her allies. She surprisingly is also quite durable (like Pendulum) though not as well-armed. Her AC lacks the firepower sufficient enough to destroy an AC and thus she is actually is the most weakly-armed AC. So you needn't pay much attention to her shots. She also rarely uses her missiles so they pose no threat.
As mentioned before, she is also has a bit of endurance, so you'd want to bring something that can rip her apart quickly. Missiles are recommended as she lacks anti-missiles defenses. It is also preferred to leave her for the last as her allies are the more threatening ones. Once they've been taken out, you can easily turn her into ashes.