I always wondered why she should fly home if it was on fire and her kids weren't there anyway said katlaughing.

That's because kat evidently didn't hear the full version - which continues (with variants, of course

All except one, and her name is Ann,
And she has crept under the warming pan.

So she's being told there may still be time to save one. Except, of course, there's no real fire - it's all just a fib to get her to get out of a dangerous environment where she could get squashed, and go off home.