Mary Poppins versus the Covenant fleet depends on canon

Who wins between Mary Poppins and the Covenant fleet?

A conventional screen version loses when the Covenant glasses the planet, but the more powerful literary or older-film interpretation can trap or displace the attackers through reality-altering magic.

The result depends on which version of Mary Poppins the question uses. One answer has a comparatively ordinary magical woman die when the Covenant glasses the planet. Other portrayals are treated as powerful enough to trap or displace the attackers through reality-altering effects. The example of an endlessly repeating corridor explains why conventional fleet firepower would not settle that version of the comparison.