You mean she wouldn't think 'why make things worse?'
And how would things get worse, exactly? Living at the povertylevel and having to feed another mouth? No kid to worry about in prison, for one thing. PLUS, bonus, "Father" out of the way.....
That's one way to look at it.
Thankfully, not every woman's.
Plus, any good defense attorney would claim temp Insanity due to the stress!