Jan (Queenscoopsalot) posted something that has stuck with me. Maybe it will help educate this girl.

Funny, how people want to see the miracle of birth, but they don't want to see the "miracle" of euthanasia.

Please don't rant at this girl. She just doesn't know yet. If you have a good relationship with her, she will be more likely to listen to your advice. And her kitty will benefit from it.