Dreaming of my sister vomiting is a warning sign as per dream meaning and interpretation. The dream means you will unnecessary worry about your sister or doubt her doing something that will cause trouble to family. It also means you doubting your sister is pregnant. Dreams of my sister vomiting and she appears tired or seeking help means serious health issue or food poisoning.
Dream of my sister vomiting and you see blood means sudden health issue to a family member. It also means change of your plans suddenly.
Dreaming of my sister vomiting and you see colors like green etc means you will see your sister getting moody or acting weirdly. It also means you need to show more maturity when dealing with problems of your sister.
Dreams of my sister vomiting and it is nonstop or like purposeful means she has been hiding her emotions and might get violent or blurt out things. It also means your sister making firm decisions and going independent.