As Rudyard Kipling put it, "The female of the species is far deadlier than the male"

When the Himalayan peasant meets the he-bear in his pride,
He shouts to scare the monster, who will often turn aside;
But the shebear thus accosted rends the peasant tooth and nail,
For the female of the species is more deadly than the male.

Or, in the present instance:

When Granny went out shopping, she did not expect to find
her car all full of strangers of the most suspicious kind -
but her heart it did not falter, her courage did not fail -
the female of the species is more deadly than the male.

So she fixed those bold intruders with a piercing scornful glance
and she pulled a pistol from her bag, and boldly did advance
and they looked at her in panic, and each one of them turned pale -
for the female of the species is more deadly than the male.

And they leapt out and they scattered, like a flock of frightened sheep
And Granny stood in triumph, with her shopping in a heap

and she thought in modest pride about the way she'd tell the tale - of how the female of the species was more deadly than the male.

So she reached into her bag again, pulled out a bunch of keys,
and she pushed the key into the lock - and her heart began to freeze
for the key it would not fit, and all at once she felt so frail -
and the female of the species blushed more redly than the male.

And parked there just alongside was a car, looked just the same,
and the other car was her car, and the shameful truth was plain
she had stolen those poor fellows car, and she gave a little wail.

But Granny did not panic - so she went to tell the law
about the thing that she had done - and she walked in, and she saw
those four big men, all shaking as they told their dreadful tale
about the female of the species being far deadlier than the male.