Know it all mother in law

My husbands mother is really starting to get on my nerves... She asks about my pregnancy (I'm a little over 5 weeks) I told her I was craving something... She told me it was to early for cravings. Today after I ate I felt sick ( I've felt sick the past couple of days) she says that's not morning sickness. Morning sickness is when you smell something that makes you sick or you get sick in the morning. I know this isn't true... How did you deal with your know it all mother in law?