How should I deal with her comments?

There's a woman at work that I have to work closely with. She WAS TTC but had two miscarriages. Now that I am pregnant she makes comments daily about how "disgusted she would be" if she was pregnant on the money we make at our job. "We just don't make enough money to raise a baby the way that I think kids should be raised". "I would be so disgusted." On and on and on... She also seems to only want to talk about things that could go wrong in a pregnancy. "Well I heard this..." and so on. She is also on the edge of her seat with anticipation whenever I come back from a doctors appt. It's like she is dying for me to come in to work and say there is something wrong. She is driving me crazy. It's very hurtful and I'm not the only one who thinks so. She has no kids at all and is 33 years old. Most of the people who work where I do have children and we all take offense to her comments about not making enough money to have kids. I have a ten year old son and I am much much better off financially now than when he was born. I am fine financially in my opinion. How do I handle her comments and not stoop to her level. I feel sorry for her. I know this is a bad case of sour gs....