Morning Sickness

Hey ladies I have a question, my sister is pregnant she's only 7 weeks but she has been really sick for weeks now with morning sickness. When I was pregnant I didn't find out that I was till I was 5 months I didn't have morning sickness at all and when I did get sick after finding out I was only sick for a week and a half so I'm not sure how to help her. I'm just wondering what are some things that you did that helped with your morning sickness??.