Well, she was rude though, because she mentioned "rotten amniotic fluid". No pregnant women over 35 yo have rotten amniotic fluid (unless mother and fetus have been both dead for hours LOL), and the problem she was trying to refer which was most likely the risk for having a baby with Down Syndrome, still makes it sound rude because women who have pregnancies with Down Syndrome babies do not have rotten amniotic fluids
However, I voted for "It was kind of tacky, but not a big deal". I think she was just ignorant about the matter after all. I can understand where could people feel offended though.