She vomits until her vomit becomes dark green.
What does she look like?
She looks like a tired person who is completely detached from all of society.
It is understandable that you are concerned about someone that is violently throwing up. You should seek out help from a medical doctor or someone you trust that can determine how severe the situation is.
I'm wondering if she might be pregnant.
She could be, I think you should talk with her and ask what is going on. If she is unable to communicate it is best to call emergency services and tell them what is going on.