Well, because she's a rich white woman. If she were a poor black woman, having children would probably result in worse treatment. Having children after being charged might get her child taken away; clearly someone who has a child while facing significant prison time would be an unfit mother.

Because you are now punishing her, and the child who will be deprived of a mother. <- not endorsing this, but that's what may be considered.

“Acted an criminal act with aim to harm the child.” Don’t see anyone suing her for that one - as an evil human being, of course- except for online underdogs screaming “crusify her!”