My guess: didn’t know she was pregnant until very late. Options were dwindling or nil. She was completely and insanely career obsessed and career-anxious.
Arrives the last month or two. Pregnancy is hard to ignore then, but it was probably daily terror and panic as she didn’t know what to do. She probably felt cornered, insane with anxiety and barely holding it together in a field that doesn’t give you any room for error.
By the time she has to deliver, her brain is likely already pure soup from the anxiety, obsessing with how she can’t handle it, how it can’t be happening, how she can’t be a mother, doesn’t want to be a mother, can’t - not doesn’t want to, but can’t! CAN’T you understand?! - stop to work.
So she delivers secretly. By this point she’s too far gone, mentally a complete mess, insane, unstable.
So she kills her newborn.
Not as a heinous premeditated act of hatred, violence and mischief, but as a completely insane act of post partum depression, psychosis, work related anxiety and sheer craziness.
She didn’t choke or shake the baby then dug a grave at night - she didn’t do some elaborate crime and elaborate body-hiding shenanigans.
She threw. The. Baby. Out. Her. Own. Window.
And she’s a lawyer.
There was no attempt whatsoever to not get caught or to act surreptitiously.
Just pure terror, psychosis and a horrible, tragic impulse that ended up terminating a new life and ruining another.