Use the following to kill zombies FAST before they get to the woman:

Method 1:
Create a “Repellent” between the zombie and the woman to keep the zombies away.
Equip Rocket Launchers and annihilate the zombies.

Method 2:
Place a “Force Field” between the zombie and the woman to keep the zombies away.
You can then take your time to kill them using things like Lava or any kinds of weapons.

Method 3:
Create an immovable wall between the woman and the zombies to protect the woman. Then equip a Gun or any kind of weapons to slowly kill the zombies.

Refer to How to Kill Zombies for more ways.

Scribblenauts Remix 5-6 Cheats Hints gallery:
5-6-1-a: Save the woman and child!
5-6-1-b: Create a wall to slow down the zombies.
5-6-1-c: Destroy the zombies with explosives.